Some months back someone here mentioned getting a Wixey digital angle gauge for measuring frame angles. This is about 2" square and can fit into tight places like the head tube on a small frame and reads to 0.1° and sells for about $40. I actually found something similar at a Canadian mail order tool place on sale for $30 that appears to be a knock-off and even included a spirit level on top.
Well, just now I was browsing the Lee Valley Tools website and found a digital angle finder for $20. While this one won't fit into really tight places, it is even more accurate, and for an amazingly low price.
http://www.leevalley.com/
(Or item # 99W63.05 if the above link breaks.)
Lee Valley Tools is a family owned Canadian operation near Ottawa. Most of their stuff is good but not cheap, so I was surprised to find this bargain. One can never have too many tools.
John Betmanis
Woodstock, Ontario
Canada