You can get the Dynamite one from your LHS, or Horizon Hobby.
Hobbico also makes a compression gauge, for under $20. The part number is hcap2600. You should be able to get this from your LHS, or TowerHobbies.
RCTech Member #2
The postings and views expressed on this site are my own and do not necessarily reflect the positions, strategies, or opinions of any company I may be employed by.