Double test function: The EMF meter can accurately detect and measure electric field radiation and magnetic field emission at the same time. It can also measure the ambient temperature (/). Double sound and visual alarm: if the tested value exceeds the preset alarm value, it immediately emits a sound and light alarm signal. Wide detection frequency and measurement range: 20Hz~300Hz magnetic field and 20Hz~3500MHz electric field of working frequency range; magnetic field 0.01~199.9T(0.1~1999mG) and electric field 0~1999V/m of measuring range. User-friendly design: Soft control buttons for alarm value setting, MAX/AVG value switching and unit conversion, the mini pocket EMF tester is powered by 3 AAA batteries, which makes it convenient to use and carry. High Accuracy and Sensitivity: Reliable for measuring electric and magnetic field radiation of mobile phone, hair dryer, computer, TV, printer, cash register, refrigerator, etc. Package includes: 1pc Electromagnetic Field Detector