... 1um 4. memory 500data 5. magnetism thickness method TG8830F Paint Coating Thickness Gauge TG8830F portable coating thickness gauge is ... layer (such as aluminum, chrome, copper, enamel, rubber, oil paint and etc) . This instrument has small error of measure, ... calibration : ±(1%+1)Calibration1 point calibration /2 point calibration /basic calibrationDisplay resolution0.1um (0~99.9um) / 1um (Over 100um ...