The Extech CG304 coating thickness tester allows non-destructive measurement of the thickness of ferrous and non-ferrous substrates with automatic detection of the material being measured. Memory for 2500 readings. The unique Bluetooth® interface transmits data wirelessly to your PC for further analysis so that you can create documented reports. Includes a special LCD display with backlight and contrast for easy reading in a wide range of lighting conditions. Includes two AAA batteries, software, hard case, metal and aluminum substrates and standard calibration foils.