60 HZ BLOCKING EMF METER 5 Calibrated Sensitivity Ranges Covering: .01 to 40 mG 3 Axis and Easy to Use High Visibility LED output, switchable dot/bar display Switchable Sound Output Switchable 60 Hz Blocking Filter This 3-axis AC gaussmeter is very unique, especially the 60 Hz filtering switch. Flip this switch to SUM to measure a wide range of frequencies (20 Hz to 100KHz). Flip to FILTER and 60 Hz signals ((±10 Hz to 3 dB, common powerline and household electricity) are NOT included in the detection. This feature combined with the LED output and switchable sound make this an excellent choice for paranormal and routine work. Readout is easy to see and hear in low light conditions, even by a group of people. 7 LED display will show 1 LED in DOT mode, or include all lower level LEDs in BAR mode. ±10% Accuracy at 60 Hz. Uses 9V battery Made in USA.