Check the listing for details. TM 191 Magnetic Field Meter with Blue EVA Carrying Case. Condition: New. Listed at 79.99 USD. This meter is used to measure electromagnetic fields of extremely low frequency(ELF) of 30 to 300Hz. The meter is capable of measuring the electromagnetic field radiation intensity that is produced from electric transmission equipment, power lines, air conditioners, refrigerators, computer monitors, video/audio devices. Comes with a blue EVA carrying case to help protect your device and accessories. Features- Display: 3-1/2 digits LCD, maximum reading 1999.- Range: 200/2000 mG,20/200μT. - Resolution: 0.1/1 mG or 0.01/0.1 μT. - Frequency response: 30Hz to 300Hz. - Sensor: Single Axis - Accuracy: ± (2.5%+6dgt) at 50Hz/60Hz. - Over load: LCD display “OL”. - Sample rate: 2.5 times per second. - Battery: 9V NEDA 1604, IEC 6F22 or JIS 006P. - Battery life: Approximate 100 hours. - Operating temperature & humidity: 5℃to 40℃,below 80% RH. - Storage temperature & humidity: -10℃ to 60℃, below 70%. - Weight: About 170g. (0.38 pounds) - Dimensions: 130(L)*56(W)*38(H)mm. (5.11 x 2.20 x 1.50) inches