User-friendly Design: soft operating buttons for the alarm value setting, MAX/AVG value switching, and units conversion, the mini pocket size EMF tester just powered by 3pcs AAA batteries, which makes it convenient for using and carrying. Audible and Visual Dual Alarm: if the tested value exceed the preset alarm value, it produce sound and light alarm signal immediately. Wide Detecting Frequency & Measurement Range: 20Hz~300Hz magnetic field and 20Hz~3500MHz electric field of working frequency range; 0.01~199.9μT(0.1~1999mG) magnetic field and 0~1999V/m electric Field of measuring range. Dual Testing Functions: the EMF meter can accurately detect and measure the electric field radiation and magnetic field emission at the same time. It also can measure the environment temperature(℃/℉). High & Sensitivity: reliable for measure electric and magnetic field radiation of mobile phone, hair dryer, computer, TV, printer, attendance machine, refrigerator, etc., Weight: 0.3968320716 pounds, Manufacturer: Xnuiasqe