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: CM8826FNWith separate probe(s)Operating principle: magnetic induction/eddy current (F/NF)Measuring range:0-1250um/0-50milResolution; 0.1/1Accuracy: +-1-3%n or +-2.5umMin. measuring area: 6mmMin. sample thickness: 0.3mmBattery indicator: low battery indicatorMetric/ imperial: convertiblePower supply: 4x1.5V AAA(UM-4)batteryAuto power off