I found a really cheap thickness gauge and digital caliper from Harbor Frieght Tools:
http://www.harborfreight.com/hand-to...uge-66319.html
I figure the digital thickness gauge would be a quick way to measure bullet expansion and other small measurements. It only measures up to about 1.1"
But they also sell a 6" digital caliper for 9 bucks:
http://www.harborfreight.com/6-inch-...per-93293.html
I'm ordering the caliper and I'll report on it.