Quickly and reliably measures electromagnetic field radiation levels around power lines, home appliances, computer monitors, video machinery and industrial devices. Easy to use. Compact and lightweight. Large LCD display. Range: 0.1 to 199.9 mG. Band width: 30 Hz to 300 Hz. Resolution: 0.1 mG. Accuracy: plus/minus 4 percent and 3 digits. Power source: 1 9-volt battery. Includes: Soft case. Battery.