I think the item number for the digital Radio Shack SPL meter is 33-2050. I used one that belonged to a friend along with his Avia test disc and it was pretty easy.
Go to E-bay or the Froogle search on Google.
They look like pretty good deals right now on both sites.

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The Answer to Life, the Universe and Everything is 42. But what IS the Question?

[This message has been edited by CBWills (edited July 30, 2004).]