Coating thickness gauge is a precision instrument used to measure the thickness of coatings, paints, platings, or other surface layers applied to substrates like metal, plastic, or wood. It ensures quality control, corrosion protection, and adherence to industry standards.

There are two main types:

1. Magnetic Induction – For non-magnetic coatings on ferrous metals (e.g., paint on steel).

2. Eddy Current – For non-conductive coatings on non-ferrous metals (e.g., anodizing on aluminum).

Some advanced models combine both technologies and offer features like digital displays, data logging, and wireless connectivity. Portable, handheld designs allow for on-site inspections in industries like automotive, aerospace, construction, and manufacturing.

Key benefits include non-destructive testing, high accuracy (±1–3%), and rapid measurements. Proper calibration and substrate selection are critical for reliable results.

By ensuring optimal coating thickness, these devices enhance product durability, compliance, and cost efficiency.