Thx for the link. I used some of the info to come up with a test that seemed to work pretty well. I will pass it on here in case anyone else wants to take advantage of it. I took a popsicle stick and placed a small strip of tape on one end and stuck a pre 1982 penny on that end. I then placed a post 1982 penny on the other end and with that end I slid it towards the edge of a table so that almost half of the stick was hanging off the table. Once I figured out where the balancing point was I marked a line on my stick that was even with the edge of the table. From that point forward I had a pretty good test for 1982 and 82 d's. Once I placed my unknown penny on the empty end of my stick I would slide it forward off the table to about halfway on the stick. If the stick fell off the table before I reached my mark on the stick, then I had a Copper penny. If the stick would balance or fall off after reaching the line on the stick then I had a Zinc penny. The zincs weigh 2.5 grams and the coppers are 3.11 grams. So finding the heavier one was all I needed to do.
Also there is a font difference which happens from time to time in penny collections if I understand correctly. There were a couple pennies made in copper with small and large type as was the zinc. Once I compared several pennies to one another it was easy enough to spot the differences.
At any rate, thanks for the lead on that sight.