English:Features: Dual Test Functions: The EMF meter can accurately detect and measure electric field radiation and magnetic field emission at the same time. It can also measure ambient temperature (/). Audible and Visual Dual Alarm: If the tested value exceeds the preset alarm value, it will immediately produce a sound and light alarm signal. Wide Detection and Measurement Range: Magnetic field 20Hz~300Hz and electric field 20Hz~3500MHz of the working frequency range; magnetic field 0.01~199.9T(0.1~1999mG) and electric field 0~1999V/m of the 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 simply powered by 3 AAA batteries, making it convenient to use and carry. High accuracy and sensitivity: Reliable to measure the radiation of electric and magnetic fields of mobile phones, hair dryers, computers, TVs, printers, attendance machines, refrigerators, etc. Specifications: Material: ABS Magnetic field intensity range: 0.01~199.9T(0.1~1999mG) Magnetic field intensity range: electric field: 0~1999V/m Magnetic field strength resolution: 0.01T/0.01mG Electric field strength resolution: 1V/m Magnetic field strength frequency range: 20Hz~300Hz Electric field strength frequency range: 20Hz~3500MHz Temperature measurement range: -10~50 Temperature resolution: 0.1 Power supply: 3 x 1.5V AAA batteries (NOT included) Item size: 130 * 50 * 27mm / 5.12 * 1.97 * 1.06in Note: The data is All measured manually, please allow 1-3cm error Due to differences in light and display, there may be some color differences, please refer to the actual item received.