On Saw Mill Creek there is a group buy for Dylos particle meters. This is a great deal! The cost drops incrementally the more people participating. If you want to determine the amount of dust in your shop and evaluate the effectiveness of your dust collection this is a relatively inexpensive solution. I would rather buy more woodworking machinery, but I also want to protect my health. So I am in. (BTW: I ran this by Steve Coles, and he said it was ok to post.) Here is a link:
http://www.sawmillcreek.org/showthread.php?t=73903
Doug
http://www.sawmillcreek.org/showthread.php?t=73903
Doug