Product synopsis 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: CM8829S With separate probe(s) Operating principle: magnetic induction/eddy current (F/NF) Measuring range:0-1250um/0-50mil Resolution: 0.1/1 Accuracy: í+1-3%n or í+2.5um Min. measuring area:6mm Min. sample thickness:0.3mm Battery indicator: low battery indicator Metric/ imperial: convertible Power supply: 4x1.5V AAA(UM-4)battery Auto power off Operating conditions:0-+45íµ(32¿H-104¿H),í_90%RH Dimensions: 126x65x27mm Weight: 81g(not including battery)