Digital Tracking Stylus Force Gauge for Phono Cartridge Lp This is The guage must have for any turntable enthusiast. Weight range: 0.001 ~ 5g. Power: 2X AAA batteries (not included) Included: stylus tracking force scales, calibration tool, calibration weight and boxed The Audio Additives Digital Stylus Force Gauge Ensures Your Tracking Force is Dead-On Accurate!