The EMF 701 is an EMF field tester from Tecpel that is designed to provide a quick, and accurate measure of the electromagnetic field radiation levels produced by power lines, cables, computer monitors, Video equipment, and many other similar devices. It has a 13 mm, 3 1/2 digit LCD display, and a bandwidth of 30Hz to 300Hz. Its measurement ranges from 0.1 to 199.9 milli gauss or 0.01 to 19.99 micro Tesla