Two Tone Generator #two-tone

K5ESS
 

As mentioned in a previous posts by Farhan and Raj there is an online generator that can provide two tones for testing.  http://www.onlinetonegenerator.com/binauralbeats.html.
However if you would like to build your own there is an article in the latest QEX by Phil Salas AD5X describing a two tone generator fabricated from two Wien bridge oscillators that are available from Ebay.  I've put together a PDF that describes the generator for those that might want to build one but don't have access to QEX.
Mike
K5ESS

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