Measurement step: Step 1. Prepare the parts to be tested. Step 2. Stay away from the metal object at least 2 cm, press the switch key to turn on. Note: it is suggested that the instrument should be zeroed with reference to "zero calibration" before testing. Step 3. The probe is placed vertically and quickly on the surface to be measured until the drop is heard, and the measured value is displayed on the screen, and then the probe is lifted at least 2 cm away from the part to be measured, and the next measurement can be carried out. Note: if the automatic shutdown function is turned on and there is no operation within 3 minutes, the instrument will automatically shut down. Specifications: Material: ABS Color: Orange, black (optional) Screen: Horizontal, vertical (optional) Measuring range: 0~2000um Precision: ±(3%'1um) Resolution: 0um~99.9um(0.1um) 100um~999um(1um) >1000um(0.01mm) Zero calibration:Support Statistics: Average, minimum, maximum, number Unit:um,mm,mils Minimum convex Radian: 5mm Minimum concave Radian: 25mm Minimum measured area: Diameter 20mm Minimum substrate thickness: 0.2mm Diameter 20mm Maximum measuring speed: 2 readings per second Power supply: 2 1.5V 7 battery (Not include) Operating environment Temperature:0 ~ 50 °C 20 ~ 90%rh (non-condensed) Preservation environment Temperature:-10 ^ 60 °C 20 ^ 90%rh (non-condensation) Size: 113mmX53mmX24mm weight: 80g Packing List: 1 * Thickness gauge 1 * Calibration piece 1 * Instructions