Erickhill RT100 The Erickhill RT100 is a sleek, affordable, handheld EMF meter that is very easy to use. It has lights and sounds to alert you of changes in EMFs. Has an optional silencer to not disturb paranormal investigations. How does it Work? The large screen displays the EMF calue in mG/µT, and the electric field in V/m. When the results are greater than (4mG) or 40V/m), the screen will turn red and the indicator will be flashes, and the device will buzz. It will power off automatically after 5 minutes without use to save on battery. Product Specs Auto shutoff feature Visual and audible alerts Detects AC Electric Field and Magnetic Field Range: 1V/m-1999V/m 0.01μT-99.99μT/0.1 mG-999.99 mG Measurement Bandwidth: 5Hz-3500MHz Sampling Time: About 0.4 second Operation Temperature: 0℃~50℃ Operation Humidity: Relative humidity below 80% Dimensions : 60*25*133mm Weight: 121g