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. Model: TM-8810 Measuring range (metric/imperial): 1.2-200mm,0.06-8inch Operating principle: ULTROSONIC 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 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: 4x1.5vaa(UM-3) battery Battery indicator: low battery indicator Operating conditions:0-+45C(32F-104F),equal to or less then 90%RH Dimensions: 160x68x32mm weight: 208g(not including battery) Optional Accessories: 6M 6mm thin Material probe:Measuring range(steel): 1.0 50.0mm Operating temperature: -10~+60C 5M 12high temperature probe: Measuring range(steel): 1.0~225.0mm(normal temperature) Measuring range(steel): 4.0~100.0mm (high temperature) Operating temperature: -10~+300C