+-----------------------+ +-------------------------+
| | | | |
| Farmer | < --------> | Agricultural Tools |
| | | | Standard Tester |
+-----------------------+ +-----------------------+
^ | ^ |
| | | |
| v v |
+------------------------+ +-------------------------+
| | <--------> | Testing instrument |
| Manufacturer | | Database |
| | | | |
+-----------------------+ +-------------------------+
^ |
| v
+-------------------+ +--------------------------+
| | | | |
|Testing Instruments < ---------> | Test Standard |
| | | | Database |
+-------------------+ +-------------------------+
^ |
| v
+-------------------+ +------------------------+
| | | | |
| Quality Control | <-----------> | Regulatory |
| Officer/Technician| | Authority |
+-------------------------+ +------------------------+