Overview: Provide user a quick, reliable & easy way to measure electromagnetic field radiation levels around power lines, home appliances & industrial devices Case material Display: 3 1/2 digits Range: 50 Hz~2000 M Hz Sampling time: about 0.4s Working voltage: 9 V Powered by 1 6F22 battery (included) Specification: Weight Approx:216.7g Size Approx:13.2 x 7 x 3