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: CM8828FN In built probe( s) Operating principle: magnetic induction/ eddy current ( F/ NF) Measuring range: 0-1250um/ 0-50mil Resolution; 0.1/ 1 Accuracy: ± 1-3% n or ± 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-+ 45 ( 32 -104 ) , d90% RH Dimensions: 126x65x27mm weight: 81g( not including battery) Optional accessories: other range 0-200um to 15000um RS-232C cable & software: 1.USB adaptor for RS-232C 2.Bluetooth interface