... “μm” or “mil ” optional.6, Micro-controller controls, high accuracy .7, Coupling state display.8, Shut down manually or automatically.9 ... :±(3%H+2μm).6, Measurement rate:0.5 second.7, Display units:μm or mil.8, Critical thickness of metallic ... 6mm.11,Probe diameter:13mm.12,Power supply:7# alkaline cell , 1.5V*3 .13,Operating environment:Temperature 0—40 °C Humidity ...