Application: 
Used for measuring thickness and corrosion of pressure vessels, chemical equipment, boilers, oil storage tanks etc. in industries of petroleum, shipbuilding, and machine manufacturing. 

Specifications:
Measuring range: 1.5-200mm, 0.06-8inch
Operating principle: ULTRASONIC 
Materials measured: any hard materials, including steel, cast iron, aluminum, red opper, brass, zinc, quartz glass, polyethylene, PVC, gray cast iron, nodular cast iron and other materials 
Sound velocity: 500-9000m/s
Lower limit steel pipes: ?15x2.0mm, ?20x3.0mm determined by the transducer
Calibration block: included
Resolution: 0.1mm
Accuracy: +/-(0.5%n+0.1)
Power supply: 4x1.5V AA(UM-3)battery
Battery indicator: low battery indicator
Operating conditions: 0-+45C(32F-104F), =90%RH
Dimensions: 160x68x32mm (6.3x2.68x1.26 inch) 
Weight: 208g / 0.46lb (not including battery)