Simply approach the source at any angle and the triple-axis meter automatically determines EMF (electro magnetic frequency) eliminating the need for additional calculations. X, Y, and Z axis results can also be viewed independently. Measures electro magnetic fields of extremely low frequency (ELF) from electrical power lines and transmission equipment, appliances, computer, HVAC, audio/video, and other electrical equipment. While the evidence of the carcinogenic effect of such electromagnetic emissions is still inconclusive, prudent avoidance is recommended to avoid excess exposure over long periods of time. Automatically or manually log results with time and date stamps. Holds up to 500 readings which can be reviewed on screen. Features manual or auto ranging, mG (milli-Gauss) and µT (micro-Tesla) scales, min/max and hold functions. The meter has tripod screws and a large 3-line display indicating when the battery is low or is reading over range. Comes ready to use in a soft carrying case, instructions and a 9V battery that lasts approximately 100 hours.