--Dual Testing Functions: the radiation 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 will produce sound and light alarm signal immediately. --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. --High Precision & Sensitivity reliable for measure electric and magnetic field radiation of mobile phone hair dryer, computer, TV, printer, attendance machine, refrigerator, etc.