The Extech CG304 Coating Thickness Tester offers a non-destructive way of measuring the thickness of ferrous and non-ferrous substrates with automatic recognition of the material being measured. Memory stores 2500 readings. The unique Bluetooth® interface feature wirelessly transmits data to your PC for further analysis, and it enables you to generate a documented report. Includes a special LCD with backlight feature and contrast for easy viewing in various lighting conditions. Complete with two AAA batteries, software, hard case, steel and aluminum substrates, and standard films for calibration.