This is a Benetech GM100 ultrasonic thickness gauge designed for non-destructive testing.
It measures the thickness of materials such as metals, plastics, glass, and ceramics ranging from 1.2mm to 225mm.
The set includes a coupling agent bottle, probe, and a hard carrying case.
It features 10 memory locations for storing and recalling thickness measurements. [1, 2, 3, 4, 5]