Measure the RF strength of Wi-Fi and LAN, cell phone, radio and TV transmission towers, wireless cameras and microphones. Sper Scientific's 3-Axis RF Meter 840047 measures RF (Radio Frequency) electromagnetic field strength in the frequency range of 50MHz to 3.5GHz. The 3-Axis probe provides simple, accurate, non-directional measurement from any angle. Results are displayed in large digits and a bar graph on a backlit LCD that also indicates maximum or average readings, low battery, and overload. You may set audible alarms a CAL (calibration) factor for a specific frequency or save and review up to 200 readings directly on the meter. Auto-ranging, with auto power off. Comes ready to use in a soft carrying case with belt loop, instruction manual and one 9V battery. Dimensions: 7¾" × 2½" × 2½" (197 × 64 × 64 mm) Weight: 10.3 oz (292 g).