Courtesy of ThinkGeek, this is a 3rd generation wireless signal detector. Because it has an LCD screen this particular WiFi sniffer can do more than just show the signal strength of wifi networks in the vicinity:
Your typical WiFi detector will only show the presence of a signal and relative signal strength - not very helpful. This Digital WiFi Detector has a backlit LCD screen that provides information on signal availability and strength as well as essential network information, including SSID, security status and channel. When multiple networks are present, the LCD will allow you to scroll through information for each network.
The device is available for about $70.00 here.
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