This paint thickness gauge from Sealey is foruse in a professional bodyshop or valeting bay to accurately verify the thickness of paint & check for accidental damage. This tool uses magnetic induction to provide accurate & consistent readings to 0.1µm & is suitable for both steel & aluminium panels. This unit is easy to calibrate with test plates & precision standards & its USB (Universal Serial Bus) interface is ideal for downloading data to a PC. Powered by two 1.5V batteries (supplied)