At first, I had a hard time figuring out what the Wi-Spy 2.4x Spectrum Analyzer actually does, as ThinkGeek says it "draws pretty graphs".

Of course those pretty graphs have a purpose as this Wi-Spy 2.4x is designed to plug into your USB drive to "increase the frequency and amplitude resolution with an added reverse-polarity SMA adapter". All that helps you find WiFi interface, as well as record and playback data traces.

If this is something that really turns your crank, then you should have no problem shelling out the $400.00 for the Wi-Spy 2.4x Spectrum Analyzer.

Via ThinkGeek