HABOTEST HT616 Car Paint Tester Paint Coating Thickness Gauge1. Zero calibration and multi point calibration: this instrument has been calibrated according to the reference data of the standard substrate (random iron and aluminum block) before leaving the factory, if the user needs to measure other materials, please calibrate the substrate to be measured 2. High sensitivity probe, just press to easily identify the material type and coating thickness 3. High speed chip is accurate and stable, with a resolution