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A measuring instrument or gauge in science and technology is used to take measurements or display specific dimensional information. Many tools perform this function, from simple pieces of material that can measure dimensions to complex machines. Depending on the use, a pressure gauge can be described as a “physical measurement device,” for example, “for determining thickness, clearance, material diameter, or flow pressure” or “a device showing the measurement of an observed system using a needle or index finger moving on a calibrated scale”.

A common and popular contention is that an instrument measures the absolute value of a metric about a gauge that establishes and deals with the metric’s compatibility with specified endpoints without providing an exact metric value within those limits.