A useful and reasonably priced meter for measuring both alternating current (AC) and direct current (DC) magnetic fields. Easy to use with an external single axis probe. This meter has an excellent frequency range of 40 Hertz (Hz) to 10 kilohertz (KHz). Can measure up to 3000 milliGauss (mG) with an accuracy of +/- 2%, with a sensitivity down to 0.1 (mG). Toggle to switch units of measure to microTesla (uT). Additional features include a north pole/south pole indicator, a zero adjustment (tare) for relative measurement, a data hold function, min/max with recall, and a 3.5 milli-meter (mm) data output jack. This meter has a quick 1 second sampling rate. Uses 6 AAA batteries (not included). Can also be powered by the external DC 9V adapter (part number #174-9, sold separately).