>I've bought some green glue to test it's damping abilities,
>and now I'm looking for a good sound meter. Not too expensive,
>but reliable. I saw a few on eBay, but wasn't sure which to pick.

Do you really need a sound meter, or are you only after relative 
measurements? If the latter then any microphone and AC millivoltmeter with 
dB scale should do. 

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