UM6800 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: any hard materials, including steel, cast iron, aluminum, red copper, brass, zinc, quartz glass, polyethylene, PVC, gray cast iron, nodular cast iron and other ultrasonic wave well-conductive materials. Features High resolution measurement Probe automatic zero calibration for system error correction Sound-Velocity-Calibration function According to the known thickness measurement Sound-Velocity. 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): 1.0-280mm,0.05-11.0inch (in Steel). Sound Velocity Range: 500~9000 m/s. Resolution 0.01mm; Accuracy ±0.05%H+0.1mm, depends on materials and conditions Units: Metric/Imperial unit selectable. Power supply: 4x1.5 AAA size (UM-4) battery 1 Operating conditions: 0-+45(32-104) 90%RH Dimensions: 140mmÃ?60mmÃ?22mm Gloss Weight :1KG Standard Delivery: Main Unit,8mm Probe, Coupling Oil, User Manual ,Carrying Case