I have done some more research on the SPL meters. For those of you that are hard core, I found a link for a modification to the meter, and an artical in Stereo times, from someone that did the modification and how it worked. It's good reading.
The link for the artical is http://www.stereotimes.com/acc032902.shtm

The link for the modification is
http://mysite.verizon.net/tammie_eric/audio/audio.html

Mjwilli