Thickness gauges
Ermenrich NT50 Thickness Gauge
https://eu.ermenrich.com/catalogue/nondestructive-testing-devices/thickness-gauges/ermenrich-nt50-thickness-gauge/
The Ermenrich NT50 Thickness Gauge is a portable thickness gauge to measure the coating thickness on ferrous or non-ferrous metallic surfaces. It can be paint, varnish, ground coat, filler, or any other type of coating. Since you only need to place the sensor on the surface, the measurement process does not cause any damage to the coating.
It will come in handy when buying a used car. It will quic