COATING THICKNESS GAUGE The Extech CG304 offers a non-destructive way of measuring the thickness of ferrous and non-ferrous substrates with auto recognition of the material being measured. Unique Bluetooth interface feature wirelessly transmits measurement data to your PC for further analysis and to generate a documented report. Features : Dual Technology provides automatic recognition of ferrous and non-ferrous substrates Magnetic induction for ferrous substrates Eddy-current measurement for non-ferrous substrates Easy-to use menu system Dot matrix LCD display with backlight and contrast Memory stores 2500 readings in 50 groups with 50 readings in each group Zero-point calibration function Complete with two AAA batteries, software, hard case, Steel and Aluminum substrates, and standard films for calibration. Includes : AAA Batteries Software Hard case Steel and Aluminum Substrates Standard Calibration Films.