480826 Triple Axis EMF Tester is designed to provide a quick, reliable and easy way to measure electromagnetic field radiation levels around power lines, electrical appliances and industrial devices. Provides Three axis (X, Y, Z direction) electromagnetic field measurement. Calibrated to measure EMF radiation at wide bandwidths from 30 Hz to 300 Hz. Complete with sensor with 3 ft. (930 mm) cable, 9V battery, and hard carrying case.