One instrument with two uses, it can test electric field and magnetic field radiation at the same time Audible alarm, when the test result exceeds the safe value, the instrument will automatically alarm Data lock, one-key lock of radiation value. LCD display of values for easier reading. Radiation assessment, remind you whether the radiation value is safe or not. Features: Unit: V/m (electric field); T (magnetic field). Accuracy: electrical: 1 V/m; magnetic: 0.01 T. Range: electrical: 1 - 1999 V/m; magnetic: 0.01 - 19.99 T. Alarm threshold: electrical: 40 V/m; magnetic: 0.4T. Display: 3-1/2 LCD screen. Test bandwidth: 5Hz - 3500MHz. Sampling time: about 0.4 seconds. Test mode: dual-module synchronous test. Overshoot indication: LCD display "1". Operating temperature: 0C to 50C. Operating humidity: relative humidity <80%. Power supply: 1 x 6F22 9V battery (not included). Note: The data are 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.