COATING THICKNESS GAUGE (combined) FUNCTION: CM-8825F (FERROUS SUBSTRATE) CM-8825N (NON FERROUS SUBSTRATE) CM-8825FN (2 IN 1, F & NF TYPE) MEASURING PRINCIPLE:MAGNETIC INDUCTION& EDDY CURRENT MEASUREMENT RANGE:0~200um/500um /1000um/2000um IN BUILT PROBE (INTEGRATED PROBE) RESOLUTION:0.1 um(under 100um) 1um (over 100um) ACCURACY: ±1~3%n or ±3um PROBE TYPE RECOGNITION: MANUAL (FOR CM-8825FN) MEASUREMENT MODE: SINGLE DATA OUTPUT: RS232C INTERFACE (OPTIONAL) POWER SUPPLY: 4x1.5V AAA(UM-4)BATTERY 2 SHUTDOWN MODELS: MANUAL/AUTOMATIC DIMENSION: 131x65x28mm Application: 1. CM-8825F can measure the thickness of non-magnetic coating layers (aluminum, chrome, copper, ename1, rubber, paint) on magnetic substrate (steel, iron, alloy and magnetic stainless steel) 2. CM-8825N can measure the thickness of non-conductive coating layers (ename1, rubber, paint, vanish, plastic anodic oxide layer) covered on non-ferrous substrate (aluminum, brass, zinc, tin and non-magnetic stainless steel)