The ELF Zone meter is the perfect meter for the beginner investigator. It is extremely easy to use and very inexpensive. CCPRS uses this meter as a hand-held and stationary device during investigations. It has a 3 LED display, Safe=Green=0-2.5 milligauss, Caution=yellow=2.5-7 milligauss and Danger=Red=7+ milligauss. The unit does not have an audio alert or a meter to accurately display the exact unit of measurement.  This unit can be found on the web for $12.00-20.00 USD.