Professional Coating Thickness Gauge Car Automotive Paint Coating Thickness Tester GM200Blue Condition: Item Type: Coating Thickness Gauge Material: Plastic + Electronic Components Target Measure: The thickness of the non-metallic coating on the metal surface Measuring Range: 0~1.80mm / 0~71.0 mil non-metallic coating on metal surface Accuracy: ±0.1mm Power Supply: AAA Battery x 2 (Not Included) Minimum Base Diameter: 50mm Critical Base Thickness: 0.5mm Display Resolution: 0.01mm / 1mil Working Temperature: 0~40°C Working Humidity: 10~95%RH Product Size: Approx. 6.2 x 3.5 x 10.5cm / 2.4 x 1.4 x 4.1in (±1-2cm) Description: 1. Since the GM200A vehicle model has built-in data, the user cannot perform calibration. In the car mode, it can directly measure the coating thickness of iron, aluminum, and zinc substrates, suitable for measuring the coating thickness of automobiles. 2. In the GM200A user mode, after calibrating the metal substrate, the user can only measure the coating thickness of this metal surface, but not other metals. For example, if you calibrate an iron substrate, you cannot measure the coating thickness of an aluminum substrate. 3. GM200A user mode calibration will not affect the car mode. 4. GM200A Car mode is the default factory setting. 5. The default factory setting of GM200A uses iron substrate to calibrate the user model. 6. According to the user model calibration, the diameter of the GM200A substrate should be ≥50mm, and the thickness of the substrate should be ≥0.5mm. 7. The critical thickness of GM200A to the base metal (≥0.5mm). 8. Edge effect: GM200A is sensitive to abrupt changes in the shape of the sample surface. Therefore, it is unreliable to measure near the edge or inner corner of the measured object. 9. GM200A can only measure non-metallic coatings.