The Extech 480846 RF EMF Strength Meter monitors high frequency radiation in the 10 MHz to 8 GHz range. Ideal for mobile phones, cell phones, base stations, locating RF hotspots, wireless network (Wi-Fi) RF detection, RF "electrosmog" detection, microwave leakage, and wireless communication applications (CW, TDMA, GSM, DECT). This meter features non-directional measurement with a 3-channel (triaxial) measurement probe, max hold and average functions, and manual store/recall of up to 99 data sets. In addition, there is an audible alarm with a user-selectable threshold. The meter comes complete with a 9 V battery and carrying case.