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Paint is a layer of coating applied to a surface in order to protect it from the elements, or for cosmetic reasons. Although the type of paint can be different, the layer of paint will still have a certain paint thickness.
A Paint Thickness Gauge (often abbreviated to PTG, and also called a Paint Depth Gauge) is an electronic device that measures the distance between the body-panel and the sensor. This way you can measure the thickness of the paint. This gives you an indication of how much paint you have left to work with.