UM6500 Ultrasonic Thickness Gauge Application Used for measuring thickness and corrosion of pressure vessels, chemical equipment, boilers, oil storage tanks, etc. in industries of petroleum, shipbuilding, power station, and machine manufacturing. Materials measured: only 11 types of materials, including steel, cast iron, aluminum, red copper, brass, zinc, quartz glass, polyethylene, PVC, gray cast iron, nodular cast iron Feature High resolution measurement Probe automatic zero calibration for system error correction Status indicator of the coupling and low battery. Auto sleep and auto power off function to conserve battery life. Humanized shape design, compact and portable, Can be used in harsh environment. Specifications: Display Digits LCD with backlight. Operating principle: ULTROSONIC Measuring range (metric/imperial): 1.0-245mm,0.05-8inch (in Steel). Resolution 0.1mm; Accuracy ±(0.5%H+0.1)mm, depends on materials and conditions Units: Metric/Imperial unit selectable. code: 11 groups Power supply: 4x1.5 AAA size (UM-4) battery Battery indicator: low battery indicator Operating conditions: 0-+45(32-104) 90%RH Dimensions: 140mm 60mm 22mm Gloss Weight :1KG Standard Delivery: Main Unit,8mm Probe,Coupling Oil, User Manual ,Carrying Case.