Lutron EMF-822A EMF Tester Pocket

Rugged, Compact, & Lightweight Magnetic Field Meter. Couldn't be easier to use, just turn it on and get accurate reliable readings. Perfect for situations needing high-resolution measurements of AC magnetic fields without spending a lot of money. Large LCD display reads 0.1 -199.9 mG over the ELF range of 30 - 400 Hz. Provides readout in both mG and microTesla. Calibrated to within 4% ±3 digits at 50/60 Hz. This single-axis meter samples every 0.4 seconds when flipped on with a slide switch. Requires one 9V battery. One-year limited warranty.