For anyone interested, you can buy a Digital Sound Level Meter at Radio Shack (PN 33-2055) for $60. Although it does not meet ANSI Standard S1.4, it claims an accuracy of +-2dB. I bought one yesterday, but have not tried it yet. It appears to be VERY trick. http://www.radioshack.com/product.asp?catalog%5Fname=CTLG&category%5Fname=CTLG%5F002%5F003%5F018%5F000&product%5Fid=33%2D2055