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. 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. 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(℃/℉). Audible and Visual Dual Alarm: if the tested value exceed the preset alarm value, it produce sound and light alarm signal immediately. High & Sensitivity: reliable for measure electric and magnetic field radiation of mobile phone, hair dryer, computer, TV, printer, attendance machine, refrigerator, etc., Weight: 0.28108938405 pounds, Manufacturer: Oewwthy