The EMF meter range measures electromagnetic fields to identify devices that produce high levels of radiation, allowing users to make informed decisions about limiting exposure. The detectors have been connected to locations where unexplained hauntings have been reported. The ghost hunting detector operates on a single battery and reports EMF measurements in the 5 milligauss range. Measures broad spectrum electromagnetic fields and records cell phone signals within a 2-foot radius. Measure EMF levels to avoid the potentially harmful effects of long-term EMF overexposure. Convenient push/push operation; portable, easy to use, rugged, reliable and responsive, with bright LED scales that are easy to read in the dark and in the sun. The first scale represents normal EMF fields, always present around us, ranging from 0 to 1.5 mG. The second scale (green) detects low-level EMF fields between 1.5 and 2.5 mG. The third scale (yellow) detects average EMF intensity between 2.5 and 10 mG. The fourth scale (orange) detects high-level EMF fields between 10 and 20 mG. The fifth scale (red) detects extremely high EMF fields of 20and mG. Product power supply: 6F229V battery (battery not included) Product size: 150x60x25mm Accuracy: 5% Measuring frequency: 50/60Hz Note: The data are all measured manually, please allow 1-3cm error due to differences in light and display, there may be some color differences, please refer to the actual item received.