Operating principle:  F type & NF type
　　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) 
　　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) 

　　Specifications:
　　Measuring range: 0-1000um
　　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 AA(UM-3)battery
　　Auto power off
　　Operating conditions: 0-+45℃(32℉-104℉), ≤90%RH
　　Dimensions: 160x68x32mm
　　Weight: 250g(not including battery)
　　Optional accessories: other range 0-200um to 15000um