GAUSS METER The Tenmars TM-190 Multi-Field EMF Meter is a small compact device that can produce take and display three measurements simultaneously: electromagnetic field (3-axis), electric field, and RF strength. The TM-190 measures high frequency electromagnetic fields (RF) in a frequency range of 50MHz - 3.5GHz and low frequency electric and magnetic fields (EMF) at 50-60Hz. Magnetic field strength is measured in milli gauss (mG) for 3 axis X, Y and Z. Electric field strength is measured in volt per meter (V/m). RF field strength is measured in millivolt per meter (mV/m. A 2.4inch colour TFT LCD screen displays the 3 results clearly all at the same time, with also the option to hold the 3 results. Specification Display: 4 digits, 2.4 inches color TFT LCD. Sample rate: 6 seconds per time. Battery life: approximate 8 hours. Battery: 1.5V AAA alkaline battery*3. Audible key tone alarm: buzzer. Operating temperature & humidity: 5°C to 40°C, below 80% RH. Storage temperature & humidity: -10°C to 60°C, below 70%. Weight: about 120g. Dimensions: 115(L) x 60(W) x 21(H) mm.