Electromagnetic Field Tester Overview Electromagnetic Field Tester. The EMF tester is designed to provide user a quick, reliable and easy way to measure electromagnetic field radiation levels around power lines, home appliances and industrial devices. The EMF tester is a cost effective, hand-held instrument designed and calibrated to measure electromagnetic field radiation at different bandwidths down to 50 Hz/60 Hz. This EMF adapter is specifically designed to determine the magnitude of electromagneti field radiation generated by power lines, computer's monitor, TV sets, video machinery and many other similar devices. Key Features Separate probe, easy operation & remote measurement Technical Details DC 9V battery . 006P Display - 13 mm (0.5") LCD, 3 1/2 digits Operating Temperature - 0Â °C to 50Â °C (32Â °F to 122Â °F)