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Check Out Wi-Spy!

inSSIDer is a great tool for analyzing Wi-Fi networks, but sometimes you need more information than just the Wi-Fi details. If you suspect interference from other wireless devices check out Wi-Spy 2.4i , Wi-Spy 2.4x or Wi-Spy DBx, our affordable, easy-to-use spectrum analyzers for 2.4 GHz and 5 GHz bands.

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Pssst.... check out inSSIDer 2 Beta

We've been working on a major update to inSSIDer and think it's ready for a few brave souls to test it out....
(Requires Windows XP SP3 or later)