The EMF tester is made of high-quality ABS material, which is sturdy and drop-resistant, durable for a long time. With high sensitivity, it can accurately measure wide-spectrum EMF from 50 Hz to 20, 000 Hz to prevent potential harm from long-term excessive exposure to EMF. Keeping you safe from radiation is good for . The EMF meter with LED light reports EMF measurement results in 5 levels, helping you understand electromagnetic fields . When the EMF is 1-2.5mG, the LED light will turn dark green, 2.5-5mG is green, 5-10mG is yellow, 10-20 is orange, 20+mG is red, easy to read no matter day or night. The electromagnetic field radiation detector is powered by 9V 6F22 dry battery, which can be used for a long time. Cordless design, more convenient to use, no need to organize the power cord repeatedly. Portable emf meters are widely used for and measuring electromagnetic fields to identify equipment producing high radiation and to help users make decisions to limit exposure, suitable for industrial and construction applications. NOTE: need 9V 6F22 dry battery, without battery size: 167 x 65 x 37MM Material: ABS colour: A-black+red Package Contents: 1 x EMF Meter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.