Measuring the thickness of the tape is a very precise thing, and the general requirements are relatively high, and precision instruments are used to measure it. For example, coating thickness gauges. A thickness gauge is an instrument used to measure the thickness of an object, and is commonly used in industrial production to continuously measure the thickness of a product. These instruments include radioactive thickness gauges that use penetrating characteristics, ultrasonic thickness gauges that use ultrasonic frequency variations, eddy current thickness gauges that use the eddy current principle, and capacitive thickness gauges. The use of microwave and laser technology to make thickness gauges is still in the development and testing stage.
