Tilswall Digital Car Coating Thickness Gauge TesterHigh Precision Probe Uses Principles of Electro magnetic InductionF probeand The Eddy Current EffectN probe, The Paint Thickness Gauge Meter Automatically Detects The Attribute of Substrates,with ZERO reset key CAL calibration key for greater accuracy of the device. Accuracy & Reliability Paint Coating Thickness Gauge Measuring Range 0 1500um, 0~59. 1mil , Accuracy (3% + 2um) , Resolution 0. 1um 0. 01mil . The Minimum: Curvature Radius 5mm, Concave