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Description: 1. Metal matrix: For magnetic methods, the basic metal surface magnetic and surface roughness of the film standard should be similar to the surface roughness of the magnetic and metal substrates. For eddy currents, the electrical properties of the base metal of the film standard should be similar to those of the metal substrate. 2. Metal substrate thickness: Check if the thickness of the base metal exceeds the critical thickness. If not, you can calibrate by following the instructions in the precautions. Edge effect: Measurements should not be made near the point of mutation near the sample, such as edges, holes and internal angles. 4. Bending: It should not be measured on the surface of the sample. 5. Readings: Usually, since each reading of the instrument is not exactly the same, different readings must be read in each measurement area. Local differences in overlap thickness also require repeated measurements in each region. 6. Surface cleaning: Remove any adhering materials such as dust, grease and corrosion products from the surface before testing, but do not remove any roofing material. Product specifications: Subject: Metallic coating on metal substrate surface without coating (unmeasured metal coating) Detection capability: non-metallic coating of surface metal 0~1.25 mm Measurement accuracy: 2% RDG ± 0.02 mm (2% reading ± 1 mil) (steel and aluminum only). Power: 3 V 1xCR2032 coin cell battery (built-in) Working current: