Trifield Flat 100xe Meter With Black EVA Carrying Case Detects 3 types of EMF pollution:AC magnetic fields, AC electric fields, radio/microwaves Frequency Range:40 Hz-100 KHz Range/Resolution @ 50Hz:100 milligauss / 0.2 milligauss Sufficiently sensitive to detect the background field almost anywhere Meter Size:5.0 x 2.6 x 2.4 in (129 x 67 x 62 mm)