Wi-Spy Spectrum Analyzer

The Wi-Spy is aimed at those who need to troubleshoot wireless networks. The software that comes with the wi-spy ariel records data so that you can trace interference and work out why your network is not performing as it should. The Wi-Spy works at 2.4GHz and connects right in to your USB port on your laptop or PC. Once connected you can then load up the software and start tracing exactly what is happening on the wifi network.

It will set you back $399.99 and you can pick one up from ThinkGeek.