This little meter measures the level of ELF magnetic field radiation from power lines, computers, kitchen appliances, & more! The easy to read scale, unique built-in audio signal and auto shut-off make it simple to use and a great way to find hidden sources of ELF frequency (50/60 Hz) magnetic fields.Hand-held, lightweight & durable, with a dramatic audio signal. Our favorite meter for demonstrating EMFs to others. Type: AC Magnetic, 40-2000HzRange: 0.1-1.0 mG and 1.0-10 mG