If all the wireless hotspots in the city were opened up, a spectrum analyzer such as this would be very useful. It's like a way to detect whether the WiFi stall is "occupied" or available without having to knock.
Wi-Spy is the world's smallest 2.4 GHz spectrum analyzer, and has been designed specifically for troubleshooting and analyzing Wi-Fi networks. It shows the signal strength for all Wi-Fi networks as well as Bluetooth, 2.4 GHz cordless phones, microwaves, Zigbee, and all other 2.4 GHz transmitters.
The device costs $99.00 and is available here.
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