The Extech CG304 Coating Thickness Tester provides a non-destructive method for measuring the thickness of ferrous and non-ferrous substrates, with automatic material recognition. Memory holds 2500 readings. The unique Bluetooth interface feature wirelessly transmits data to your PC for further analysis, allowing you to compile a detailed report. Special LCD with backlighting and contrast for easier viewing in different lighting settings. The kit includes two AAA batteries, software, a protective case, steel and aluminum substrates, and standard calibration films.