... )1um(over 100um)Specification:MODELCM-8825F (FERROUS SUBSTRATE)CM-8825N (NON FERROUS SUBSTRATE)CM-8825FN (2 IN 1, F & NF TYPE)Measuring ... SUPPLY4X1.5V AAA(UM-4)BATTERYDIMENSION131x65x28mmApplication 1. CM-8825F can measure the thickness of non-magnetic coating layers (aluminum, chrome, copper, ename1, ... substrate (aluminum, brass, zinc, tin and non-magnetic stainless steel) Coating Thickness Meter