A little more info
You won’t be settling for less with this handy tool. It monitors frequency radiation in the 10 MHz to 8 GHz range for: laptops, smartphones, mobile phone base station antenna radiation, baby monitors, blue tooth, RF power measurement for transmitters, wireless LAN (Wi-Fi) detection/installation, wireless communication applications (CW, TDMA, GSM, DECT) and microwave oven leakage tests. The Acoustimeter provides LED light and LCD text displaying peak, peak hold, and average levels of radio frequency electromagnetic fields, covering the spectrum from TETRA all the way up to and beyond the 5.6 GHz Wi-Fi and WiMax frequencies. It has a digital readout which is sensitive 0.02 V/m - 6.00 V/m and a sound output enabling you to hear the signal modulation. These features make the instrument the most useful one available to even those with severe electro sensitivity. A less sophisticated, less expensive meter by EMFields is here.
Important: This is a CALIBRATED meter. I only sell this meter when it's calibrated by a certified electrical engineer as I had one that wasn't and found I was not getting accurate measurements)