The coating thickness gauge is used for measuring coating or paint thickness. It is used for coatings of zinc (galvanizing), aluminum, copper, chromium (chrome plating), electrostatic paint, anodizing, etc. It is commonly used in industrial applications and in automobiles to measure the thickness of paint, plating, and other coatings on metal and other surfaces. The gauge operates using principles of electromagnetic induction, eddy currents, or ultrasonic waves to measure the coating thickness.