... Portable Paint Coating Thickness Gauge 2.Compact aluminum outershell ,F&NF 3.range 0~1250um,other range is ok ... PRINCIPLE Operating principleApplicationFor example(F Type) Magnetic inductionCan measure the thickness of non-magnetic coating layers on magnetic substrate.Such as:( ... ,chrome,copper,enamel,rubber,paint)on magnetic substrate(steel,iron,alloy and magnetic stainless steel.(NF Type) Eddy current ...