The NorthStar club will bring their rotary engine compression tester along and let people use it on their cars. This is a genuine Mazda rotary compression tester, and gives better results and is easier to use than a modified piston engine compression tester.

The MRR program has info on how to test, what are good/bad results, etc. It is a nice write-up.

Cheers,

Steve

Here's a pic of the Mazda rotary compression tester:

http://www.scuderiaciriani.com/MRR/compression_tester.jpg