Trifield Combo Pack 3-axis - Detects 3 types of EMF pollution:AC magnetic fields, AC electric fields, radio/microwaves Frequency Range:40 Hz-100 KHz Range/Resolution: 100 milligauss / 0.2 milligauss Specialized meter with flat response at 60Hz. Not sensitive above 2000 Hz Meter Size:5.0 x 2.6 x 2.4 in (129 x 67 x 62 mm)