1. Measurement instrument method

The usage includes vernier caliper, micrometer, plug gauge, etc.

2. Magnetic method

The accurate measurement of the thickness of the coating layer by magnetic method is a non-destructive and accurate measurement of the non-magnetic coating layer by magnetic coating thickness gauge.

3. Optical microscopy

The optical microscopy method is called metallography, in which a standard, corroded piece is enlarged on a stereoscopic microscope with a micrometer eyepiece to accurately measure the thickness of the coating on a cross section.

4. Countdown liquid flow method

Countdown liquid flow method is to be able to make the coating dissolved in a part of the solution on the surface of the coating, according to the dissolution of part of the coating must end time, to calculate the thickness of the coating.Also has the coating drop method, the anodic oxidation solution coulomb method and so on.