Operating principle:
　　CM-8825F: F type(magnetic induction), measure the thickness of non-magnetic coating
　　layers such as (aluminum,chrome,copper,ename1,rubber,paint) on magnetic substrate
　　(steel, iron, alloy and magnetic steel) 
　　CM-8825N: NF type (eddy current), 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) 
　　CM-8825FN: F type & NF type 

　　Specifications:
　　In built probes
　　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℉), ≤90%RH
　　Dimensions: 126x65x27mm
　　Weight: 81g(not including battery)
　　Optional accessories: other range 0-200um to 15000um