Feature 1Dual Detection Function: The EMF meter can accurately detect and measure both electric field radiation and magnetic field emission. It can also measure the ambient temperature (C F). 2Dual Audible and Visual Alarm: If the test value exceeds the preset alarm value, the EMF meter will immediately generate an audible and visual alarm signal. 3Wide Detection Frequency and Measurement Range: The EMF meter can detect magnetic fields from 20Hz to 300Hz and electric fields from 20Hz to 3500MHz in the operating frequency range, and can measure magnetic fields from 0.01 to 199.9T (0.1 to 1999mG) and electric fields from 0 to 1999V/m. 4User Friendly Design: The EMF Meter has soft operation buttons for alarm value setting, Maximum, Average switching and unit conversion, and the mini pocket sized electromotive force tester is powered by only 3 AAA batteries(not included), making it easy to use and carry. 5Wide Application: The EMF Meter is very reliable and can measure electric and magnetic field radiation from mobile phones, hair dryers, computers, TVs, printers, time and attendance machines, refrigerators, etc.Item Type: EMF MeterMaterial: ABSModel: ST1393Magnetic Field Strength Range: 0.01 to 199.9T (0.1 to 1999mG)Electric Field Strength Range: 0 to 1999V/mMagnetic Field Strength Resolution: 0.01T/0.01mGElectric Field Strength Resolution: 1V/mMagnetic Field Strength Frequency Range: 20Hz-300HzElectric Field Strength Frequency Range: 20Hz-3500MHzTemperature Measurement range: -10 to 50Temperature Resolution: 0.1Power Supply: 3 x 1.5V AAA batteries (not included) . Package List1 x EMFMeter1 xInstruction Manual