testo 420 · Flow Hood

Instruction manual
2
 1 Contents

1 Contents
1 Contents ...................................................................................................3
2 Safety and the environment ....................................................................4
2.1. About this document ........................................................................4
2.2. Ensure safety...................................................................................5
2.3. Protecting the environment ..............................................................5
3 Specifications ..........................................................................................5
4 Technical data ..........................................................................................6
5 Product description ...............................................................................10
5.1. Overview........................................................................................10
5.1.1. Measurement setup ....................................................................................... 10
5.1.2. Overview of testo 420 .................................................................................... 11

6 First steps ..............................................................................................13

7 Using the product ..................................................................................15
7.1. Switching Bluetooth® on and off....................................................15
7.2. Settings for the measurement........................................................16
7.2.1. Damping (Gliding Average) ............................................................................ 16
7.2.2. Hood Calibration ............................................................................................ 16
7.2.3. Zeroing Interval (Automatic Zeroing) .............................................................. 16
7.3. Volume flow measurement setup ..................................................17
7.4. Measuring ......................................................................................19
7.4.1. Volume flow measurement............................................................................. 19
7.4.2. Pitot tube measurement ................................................................................. 20
7.4.3. Differential pressure measurement ................................................................ 22
7.5. Saving ...........................................................................................22
7.6. Transferring measurement data to the PC ....................................23
8 Maintaining the product ........................................................................24
8.1. Cleaning the instrument .................................................................24
9 Tips and assistance...............................................................................24
9.1. Questions and answers .................................................................24
9.2. Accessories and spare parts .........................................................24
10 Authorizations........................................................................................26

3
2 Safety and the environment

2 Safety and the environment

2.1. About this document
Use
> Please read this documentation through carefully and
familiarize yourself with the product before putting it to use. Pay
particular attention to the safety instructions and warning advice
in order to prevent injuries and damage to the products.
> Keep this document to hand so that you can refer to it when
necessary.
> Hand this documentation on to any subsequent users of the
product.

Symbols and writing standards

Representation Explanation
Warning advice, risk level according to the
signal word:
Warning! Serious physical injury may occur.
Caution! Slight physical injury or damage to
the equipment may occur.
> Implement the specified precautionary
measures.
Note: Basic or further information.

1. ... Action: more steps, the sequence must be

2. ... followed.
> ... Action: a step or an optional step.
- ... Result of an action.
Menu Elements of the instrument, the instrument
display or the program interface.
[OK] Control keys of the instrument or buttons of
the program interface.
... | ... Functions/paths within a menu.
“...” Example entries

4
 3 Specifications

2.2. Ensure safety

> Do not operate the instrument if there are signs of damage at
the housing, mains unit or feed lines.
> Do not perform contact measurements on non-insulated, live
parts.
> Do not store the product together with solvents. Do not use any
desiccants.
> Carry out only the maintenance and repair work on this
instrument that is described in the documentation. Follow the
prescribed steps exactly. Use only original spare parts
from Testo.
> Dangers may also arise from the systems being measured or
the measuring environment: Note the safety regulations valid in
your area when performing the measurements.

2.3. Protecting the environment

> Dispose of faulty rechargeable batteries/spent batteries in
accordance with the valid legal specifications.
> At the end of its useful life, send the product to the separate
collection for electric and electronic devices (observe local
regulations) or return the product to Testo for disposal.

3 Specifications
The testo 420 is used for volume flow measurements (main
application), Pitot tube measurements and pressure measurements
for air conditioning and ventilation systems. Thanks to its
interchangeable flow hoods, the testo 420 can be used for air inlets
and outlets of various sizes.
With the additional App (Android/iOS), the readings can be
conveniently displayed on a tablet or smartphone, and in addition a
measurement can be started, stopped and saved via the App.

5
4 Technical data

4 Technical data
The use of the wireless module is subject to the regulations and
stipulations of the respective country of use, and the module may only
be used in countries for which a country certification has been
granted. The user and every owner has the obligation to adhere to
these regulations and prerequisites for use, and acknowledges that
the re-sale, export, import etc. in particular in countries without
wireless permits, is his responsibility.
Feature Values
Measurement Temperature: °C / °F
parameters Humidity: %RH / %rF / td°C / WB°C
Flow velocity : m/s / ft/min
Volume flow: m³/h / cfm / l/s
Pressure (absolute pressure): hPa / mbar / kPa
Pressure (differential pressure): Pa / hPa /
mbar / mmH2O / inH2O
Measuring cycle 1/sec
Interfaces Probe interface Mini DIN
Micro USB
Measuring ranges Temperature: -20 to +60 °C / -4 to 140 °F
Humidity: 0 to 100% RH (Not for condensing
atmospheres. For continuous application in
high humidity (> 80 %RH at ≤ 30 °C for > 12
h, > 60 %RH at > 30 °C for > 12 h), contact
us via www.testo.com.)
Wet bulb temperature: -20 to +60 WB°C
Dew point: -76 to +60 td°C
Flow velocity: 0 to 14 m/s /
0 to 2750 ft/min
Volume flow: 50 to 4000 m³/h /
30 to 2350 cfm / 11 to 1100 l/s
Pressure (absolute pressure):
700 to 1100 hPa
Pressure (differential pressure): -
120 to +120 Pa

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 4 Technical data

Feature Values
Resolution Temperature: 0.1 °C / 0.1°F
Humidity: 0.1% RH
Flow velocity: 0.01 m/s
Volume flow: 1 m³/h / 1 cfm
Pressure (absolute pressure): 0.1 hPa /
0.1 mbar / 0.01 kPa
Pressure (differential pressure): 0.001 Pa /
0.00001 hPa / 0.00001 mbar / 0.0001 mm
H2O / 0.000001 inH2O
Accuracy Temperature: ±0.5 °C (0 to +70 °C) / ±0.8 °C
(nominal temperatur (-20 to 0 °C)
e 22°C/71.6°F)
Humidity: ±1.8% RH +3% of m.v. at +22 °C
(5 to 80% RH) (longer high humidity
application can result in a temporary sensor
drift)
Flow velocity: no accuracy specification since
calculated variable
Volume flow 1: ±3% of m.v. +12 m³/h at
+22 °C, 1013 hPa (85 to 3500 m³/h)
±3% of m.v. +7 cfm at +72 °F, 405 inH₂O (50
to 2,060 cfm)
Error absolute pressure compensation:
±0.04% of m.v. / hPa deviating from 1013 hPa
Pressure (absolute pressure): ± 3 hPa
Pressure (differential pressure): ±2% of m.v. +
0.5 Pa (at 22°C, 1013 hPa)
Error absolute pressure compensation:
±0.04% of m.v. / hPa deviating from 1013 hPa

Minimum outlet size:

335 x 335 mm.
For smaller outlet sizes, the accuracy
specifications may vary.

1All accuracy specifications apply under laboratory conditions or with necessary

compensation (correction factor) with the standard hood 610x610 mm. Minimum
outlet size of 360x360 mm

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4 Technical data

Feature Values
Please ensure that the volume flow
hood is situated at the minimum
distance from the floor.
Incoming air (air flows from the outlet
into the room): 1 x height of the flow
hood.
Outgoing air (air flows from the room
into the duct): 0.5 x height of the flow
hood.
Temperature Humidity: ± 0.03% RH / K (deviating from
coefficient 22°C, in the range 0 to 60 °C)
Volume flow: ± 0.02% of m.v. / K
(deviating from 22 °C, in the range 0 to 60 °C)
Pressure (absolute pressure): ± 0.02% of
m.v. / K (deviating from 22 °C, in the range
0 to 60 °C)
Pressure (differential pressure): ± 0.02% of
m.v. / K (deviating from 22 °C, in the range
0 to 60 °C)
Response time t90 Temperature: approx. 45 s
Humidity: approx. 15 s
Flow velocity: approx. 1 s
Volume flow: approx. 1 s
Pressure (absolute pressure): approx. 1 s
Pressure (differential pressure): approx. 1 s
Operating and Storage temperature: -20 to +60 °C / -4 to
ambient conditions 140 °F
Operating temperature: -5 to +50 °C/+23 -
+122°F
Humidity: 0 to 100% RH
Pressure range: 800 to 1100 hPa

8
 4 Technical data

Feature Values
Housing / Measuring instrument housing material: ABS
measurement setup Body material: PP
Standard hood material: Nylon
Measuring instrument dimensions:
150x85x35 mm
Body dimensions: 510x456x148 mm
Dimensions of measurement setup with
standard hood: 610x970x610 mm
Weight of entire measurement setup
approx. 2900 g
Power supply 4 x 1.5 V rechargeable/non-rechargeable
batteries
Type AA / alkaline manganese, mignon
Battery lifetime: approx. 40h (eroing interval
10 seconds, display illumination off,
Bluetooth off)
Display Type: Dot matrix
Dimensions: 3.5 inches
Directives, EU guideline: 2014/30/EU
standards and tests

9
5 Product description

5 Product description
5.1. Overview
5.1.1. Measurement setup

1 Volume flow hood (standard hood 610x610 mm)

2 Actuator for manual measurement
3 Measuring instrument testo 420
4 Measurement base with differential pressure cross
5 Integrated flow straightener

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 5 Product description

5.1.2. Overview of testo 420

1 Battery compartment, on rear of the instrument

2 Display
3 Control keys
4 Probe socket Mini-DIN (only for use on the measurement base)
5 Micro-USB port
6 Connection for pressure measurement

Instrument status icons:

Icon Meaning
Battery capacity
Bluetooth

/ / Measuring mode:
Pressure measurement, Pitot tube, volume
flow (air pressure from above into the hood /
suction outlet)
Actual Actual volume flow:
The current ambient conditions are used to
calculate the volume flow. The actual
barometric pressure is measured with the
internal sensor. In applications with volume
flow hood, the temperature is measured by
the integrated temperature/humidity sensor,
with Pitot tube measurement the actual
temperature needs to be input manually.

11
5 Product description

Icon Meaning
Standard Standard volumetric flow:
The standard settings for temperature and
barometric pressure (21 °C / 1013 hPa in
accordance with the standard conditions of
the NIST, National Institute of Standards and
Technology) are used to calculate the
volume flow.
K-factor Factor by which the current reading is
multiplied. Depends on which outlet
measurements are being taken at.
Pitot Tube factor The Pitot tube factor for Pitot tubes is
(P-factor) generally the same and must be entered:
• Pitot tubes from Testo: 1.00
• Pitot tubes from other manufacturers: the
Pitot tube factor can be found in the
instruction manual or you should ask
your supplier.

Control keys
Key Function
Menu

[►, ■] Holds / starts / stops a measurement

[ESC] Switches to the previous view / to the
measurement view
Saves the measured values

[►, ▲, ▼,◄] Navigation within the menu

[ ] Confirms a selection
Switch instrument on/off (press and hold
down)
Switch illumination on/off (press briefly)

12
 6 First steps

6 First steps
Inserting batteries/rechargeable batteries
1. Open the battery compartment.
2. Insert the batteries or rechargeable batteries (scope of delivery
includes 4x 1.5V Type AA/ LR6).
3. Close the battery compartment.
When not in use for a long period of time, take the
batteries/rechargeable batteries out.

Implementing settings
1. Press to access the menu.
2. Select the menu item you require using ►, ▲, ▼, ◄.

Key functions
Display Explanation
►, ▲, ▼,◄ Change parameter, select unit
Confirm input

1. Menu Level 2. Menu Level 3. Menu Level

Application Flow Hood K-factor
Actual/Standard
Pitot tube Duct
Pitot tube factor
Pitot Temperature
Actual/Standard
Pressure only --
Measuring Program Single Measurment --
Continous --
Measurement 2

2 Maximum of 15 minutes, measuring cycle 1 second

13
6 First steps

1. Menu Level 2. Menu Level 3. Menu Level

Continous/Punctual measuring duration 3
measurement (nur für
Staurohr)
Memory New Folder --
T420 folder --
Display Volume Flow on/off
Diff.Pressure on/off
Temperature on/off
Velocity on/off
Humidity on/off
Abs.Pressure on/off
Device Settings Language English/German/Itali
an/French/Spanish
Backlight Auto Off On/Off
Auto Off On/Of
Bluetooth On/Off
Date&Time Date Format
Time Format
Set Date&Time
Gliding average 5 – 20 sec
Hood adjustment Supply Air
Exhaust Air
Zeroing int 1-20 sec
Reset Device -- --

3 Maximum of 25 points and 1 minute per point.

14
 7 Using the product

7 Using the product

7.1. Switching Bluetooth® on and off
In order to be able to establish a connection via Bluetooth,
you need a tablet or smartphone with the Testo App testo
420 already installed on it.
You can get the App for iOS instruments in the App Store
or for Android instruments in the Play Store.
Information about compatibility can be found in the
relevant App Store.
Measurements can be performed and saved with App into
the instruments memory. Measuring mode and save
function on the instrument itself is not available during
Bluetooth communication is established with a mobile
device.

Switching on Bluetooth
1. Hold ▲ down for 3 seconds.
- Once the Bluetooth icon is shown on the display, Bluetooth is
switched on.
- If no connection is established, Bluetooth switches off after 10
mins.
or
1. Press -> Device Settings -> Bluetooth, ► and using ▲/▼
-> select Off. Confirm with .
- Once the Bluetooth icon is shown on the display,
Bluetooth is switched on.
- If no connection is established, Bluetooth switches off after 10
mins.

Display Explanation

flashes There is no Bluetooth connection, or a

potential connection is being searched for.

is permanently There is a Bluetooth connection.

displayed

is not displayed Bluetooth is disabled.

15
7 Using the product

7.2. Settings for the measurement

The sensor must not be exposed to volatile chemicals
such as solvents (e.g. ketene, ethanol, isopropyl alcohol,
toluene) or organic compounds, especially in high
concentrations and corresponding gases, over a
prolonged period of time.

7.2.1. Damping (Gliding Average)

If the readings fluctuate widely, it is advisable to damp the
readings. The time range for the damping can be set manually
between 5-20 seconds.
1. Press , then select Device settings and Gliding average.
- The damping can be set between 5-20 seconds.

7.2.2. Hood Calibration

This input is provided for the filing of calibration data by the relevant
calibration laboratory. The flow hood-specific adjustment data can
be input manually for supply air and exhaust air and has a direct
effect on the measurement results. Input option of 0.001-9.999.
1. Press , then select Device settings and Hood adjustment.
- Calibration of the hood can be set for supply air and exhaust air.

7.2.3. Zeroing Interval (Automatic Zeroing)

The pressure sensor carries out automatic zeroing at regular
intervals. These intervals can be set via the automatic zeroing.
1. Press , then select Device settings and Zeroing int.
- The zeroing interval can be set between 1-20 seconds.

16
 7 Using the product

7.3. Volume flow measurement setup

Standard hood
(610x610 mm, scope of delivery; 360x360 mm, accessories)

1. Pull the lower end of the hood over the measurement base.
2. Attach the hood at two corners using the snap fasteners.
3. Tighten the closure.
4. Screw together a short and long section of the support rods (4x)
at the silver ends.
5. Push the support rods (4x) through the hood, along the
markings and into the funnel in the measurement base.
6. Push the support rods (4x) on the top of the hood into the
bracket
- The hood is installed.

17
7 Using the product

Large hood
(1220x610 mm, 1220x305 mm and 915x915 mm, accessories)

1. Install the aluminium frame and stretch the fabric hood over the
framework, so that the elastic band lies in the recess of the
frame. Make sure that the elastic band fits correctly, especially
at the corners.
2. Pull the lower end of the hood over the measurement base.
3. Attach the hood at two corners using the snap fasteners.
4. Tighten the closure.
5. Screw together a short and long section of the support rods (4x)
at the silver ends.
6. Push the support rods (4x) through the hood, along the
markings and into the funnel in the measurement base.
7. Push the support rods (4x) on the top of the hood into the
bracket
- The hood is installed.

18
 7 Using the product

Attaching the measuring instrument

1. Push the testo 420 completely into the instrument holder, pay
attention to the catch on the right-hand and left-hand side in the
bracket.

7.4. Measuring
7.4.1. Volume flow measurement
✓ The volume flow hood is fitted.
1. Switch on the instrument.
2. In the instrument settings, set the application volume flow hood
and also the required measurement program:
Single measurement or Continuous measurement.

19
7 Using the product

3. Press ►, ■ on the testo 420, or the trigger on the measurement

base to hold or start and stop the measurement.
4. Press to save the measurement data. Unsaved
measurement data is lost once you carry out the next
measurement.
- The target folder and file name are displayed, confirm with
to save the measurement data under this name and in the
selected folder.

7.4.2. Pitot tube measurement

1. Remove the testo 420 from the measurement base.
2. Connect the hoses to the testo 420 and to the Pitot tube.
3. Press -> Application -> Pitot tube and there set the duct
geometry, the Pitot tube factor and the temperature, and
choose between actual and standard.
4. Select the required measurement program.
With a timed/multi-point measurement program, the
required number of measuring points can be recorded
using [►, ■]. To end the measurement, press and hold
down [►, ■] for at least 3 s. At least one measuring point
must be recorded before the measurement can be
terminated.
5. Carry out the measurement.
6. Press to save the measurement data. Unsaved
measurement data is lost once you carry out the next
measurement.
- The target folder and file name are displayed, confirm with
to save the measurement data under this name and in the
selected folder.
The Pitot tube factor for Pitot tubes is generally the same
and must be entered:
Pitot tubes from Testo, Pitot tube factor: 1.00
Straight Pitot tubes from Testo, Pitot tube factor: 0.67
Air flow velocity matrix 0699.7077, Pitot tube factor: 0.82
For Pitot tubes from other manufacturers, refer to the
instruction manual for the Pitot tube factor or ask your
supplier.

20
 7 Using the product

7.4.3.

21
7 Using the product

7.4.4. Differential pressure measurement

1. Remove the testo 420 from the measurement base.
2. Connect the hoses to the testo 420 at + and -.
3. Press -> Application -> Pressure only.
4. Carry out the measurement.
5. Press to save the measurement data. Unsaved
measurement data is lost once you carry out the next
measurement.
- The target folder and file name are displayed, confirm with
to save the measurement data under this name and in the
selected folder.

7.5. Saving
A maximum of 99 measurements can be saved in one
folder.

> -> Memory ->

- The folder overview is shown on the display. Create a new
folder via New Folder.
A maximum 100 folders can be created.

Open folder
> Using the arrow keys, navigate to the required folder and press
.
- The selected folder is opened and the individual files are
displayed.

Delete folder
1. Using the arrow keys, navigate to the required folder and press
.
2. Select the menu item Delete Folder and confirm with .
- The folder that you want to delete is shown on the display.
3. Confirm once again with in order to delete the folder,
or cancel by pressing Esc.

Set as Logging Folder

This setting establishes which folder is to be specified as the
standard storage location for saving the measurements.

22
 7 Using the product

The folder which is set as the standard storage location is

marked in black.
1. Using the arrow keys, navigate to the required folder and press
.
2. Select the menu item Set as Logging Folder and confirm with
.
- The selected folder is set as the standard storage location.
- The stored location can be changed during the saving process.

Total Volume Flow

If data from single measurements is saved within a folder,
the total volume flow of all measurements can be
displayed using this function.
1. Using the arrow keys, navigate to the required folder and press
.
2. Select the menu item Total Volume Flow and confirm with .
- The single measurements and the total volume flow are
displayed.
3. Press .
- The result of the total volume flow is saved.

7.6. Transferring measurement data to the PC

No Bluetooth connection is possible while there is a
connection to the PC. The existing Bluetooth connection is
aborted.

The PC identifies the testo 420 as a removable medium.

In the event of any formatting, please make sure that the
FAT format is always selected under the file system.
1. Connect the testo 420 to your PC using the USB cable.
- The testo 420 switches on automatically, a window appears on
the PC, select Open folder here. The folders and files saved on
your testo 420 are displayed. The files are available in the file
format *.txt.

23
9 Tips and assistance

8 Maintaining the product

8.1. Cleaning the instrument
Do not use any aggressive cleaning agents or solvents!
Mild household cleaning agents or soap suds may be
used.
> If the housing of the instrument is dirty, clean it with a damp
cloth.

9 Tips and assistance

9.1. Questions and answers
Question Possible causes/solution
For selected parameters, No temperature/humidity probe is
no values are shown on connected, for instance.
the instrument display
(-----)
Warning message Can not • This parameter is not available for
turn on! when selecting the application currently selected.
certain parameters in the • Four parameters are already
Display menu. displayed. Disable the display of
one parameter to enable another
one.
• [►, ■] on the • Bluetooth connection is active, the
instrument does not instrument is connected to a Tablet
work. or Smartphone via Bluetooth and
• Warning message the App is active.
Function not • Fully close the App or end the
available in Bluetooth Bluetooth connection.
mode.

9.2. Accessories and spare parts

Description Article no.
testo 420 differential pressure measuring 0560 0420
instrument (stand-alone device)
Flow hood 360x360 mm with bag 0554 4200

24
 9 Tips and assistance

Description Article no.

Flow hood 305x1220 mm with bag 0554 4201
Flow hood 610x1220 mm with bag 0554 4202
Flow hood 915x915 mm with bag 0554 4203
Fabric cover for the hood 610x610 0400 4200
Aluminium frame for the hood 610x610 0440 4204
Tripod, extendable to 4 m 0554 4209
Connection hose, silicone, length 5 m, 0554 0440
maximum load capacity 700 hPa (mbar)
Connection hose, silicone-free, for differential 0554 0453
pressure measurement, length 5 m,
maximum load capacity 700 hPa (mbar)
Pitot tube, length 500 mm, Ø 7 mm, stainless 0635 2045
steel, for measuring flow velocity
(Connection hose required)
Pitot tube, length 350 mm, Ø 7 mm, 0635 2145
stainless steel, for measuring flow velocity
(Connection hose required)
Pitot tube, 1,000 mm long, stainless steel, 0635 2345
measures flow velocity
(Connection hose required)
Connection hose 0554 0453
Tension rod 0440 4201
Air flow velocity matrix, telescope with 0635 8888
spherical head, length 1.8 m, with 2 x 2 m Testo ID no.
connection hose, silicone-free, with Velcro 0699.7077/1
fastening on the telescope
Air flow velocity matrix, telescope with 0635 8888
spherical head, length 1.8 m, with 2 x 2 m Testo ID no.
connection hose, silicone-free, with Velcro 0699.7077/2
fastening on the telescope and testo 420
measuring instrument

For a complete list of all accessories and spare parts, please refer
to the product catalogues and brochures or visit our website
www.testo.com
If you have any questions, please contact your dealer or Testo
Customer Service. The contact details can be found on the back of

25
10 Authorizations

this document or on the Internet at www.testo.com/service-

contact..

10 Authorizations
Please note the following country-specific information for the
product authorization.
Product Testo 420

Mat.-No. 0560 0420

Country Comments

Australia
E1561

RCM mark Supplier identification

New Authorized
Zealand

Turkey Authorized

Canada Product IC ID: 12231A-05600420

IC Warnings

China CMIIT ID: 2015DP4400

USA Product FCC ID: 2ACVD05600420

FCC Warnings

Korea

MSIP-CMM-Toi-420
KCC Warning

South
Africa Radio Equipment Type approval numer: TA-2016/3100

Europa +
EFTA
The EU Declaration of Conformity can be found on the testo
homepage www.testo.com under the product specific downloads.

26
 10 Authorizations

EU countries:
Belgium (BE), Bulgaria (BG), Denmark (DK), Germany (DE), Estonia (EE), Finland
(FI), France (FR), Greece (GR), Ireland (IE), Italy (IT), Latvia (LV), Lithuania (LT),
Luxembourg (LU), Malta (MT), Netherlands (NL), Austria (AT), Poland (PL),
Portugal (PT), Romania (RO), Sweden (SE), Slovakia (SK), Slovenia (SI), Spain
(ES), Czech Republic (CZ), Hungary (HU), United Kingdom (GB), Republic of
Cyprus (CY).

EFTA countries:
Iceland, Liechtenstein, Norway, Switzerland

Japan Radio

201-150304

Japan Information

Brazil

Este equipamento não tem direito à proteção contra interferência prejudicial e não
pode causar interferência em sistemas devidamente autorizados.

Taiwan NCC: CCAB16LP2190T1

Bluetooth
Feature Values
SIG List
Bluetooth® Range 15 m (free field)
(varies with the used mobile device)
Bluetooth® type LSD Science & Technology Co., Ltd
L Series BLE Module (08 Mai 2013) based on TI
CC254X chip
Qualified B016552
Design ID
Bluetooth® radio class Class 3
Bluetooth® company ID 10274

IC Warnings
This instrument complies with Part 15C of the FCC Rules and
Industry Canada RSS-210 (revision 8). Commissioning is subject to
the following two conditions:
(1) This instrument must not cause any harmful interference and
(2) this instrument must be able to cope with interference, even if
this has undesirable effects on operation.

27
10 Authorizations

Cet appareil satisfait à la partie 15C des directives FCC et au standard Industrie Canada
RSS-210 (révision 8). Sa mise en service est soumise aux deux conditions suivantes :
(1) cet appareil ne doit causer aucune interférence dangereuse et
(2) cet appareil doit supporter toute interférence, y compris des interférences qui
provoquerait des opérations indésirables.

FCC Warnings
Information from the FCC (Federal Communications Commission)
For your own safety
Shielded cables should be used for a composite interface. This is to ensure continued
protection against radio frequency interference.

FCC warning statement

This equipment has been tested and found to comply with the limits for a Class C digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable protection against harmful interference in a residential installation. This
equipment generates, uses and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment off and on, the
user is encouraged to try to correct the interference by one or more of the following
measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that to which the
receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.

Caution
Changes or modifications not expressly approved by the party responsible for
compliance could void the user's authority to operate the equipment. Shielded interface
cable must be used in order to comply with the emission limits.

Warning
This device complies with Part 15 of the FCC Rules.
Operation is subject to the following two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received,
including interference that may cause undesired operation.

KCC Warning
해당 무선 설비는 운용 중 전파혼신 가능성이 있음

Japan Information
当該機器には電波法に基づく、技術基準適合証明等を受けた特定無線設備を装着してい
る。

28
Testo SE & Co. KGaA
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Germany
Telefon: +49 7653 681-0
E-Mail: info@testo.de
Internet: www.testo.com

0970 4200 en 07