I have been collecting tank pressure testers if I find them cheap and recently got a new one. I like to have a matching tester for the regs. The new one is a Healthways but I think I may have stubbled onto a good one. Testing it, I could not for the life of me get the thing to seal and there was no appearant way to vent it if I did. Plus, it seemed overly complicated for a simple tank checker, 2 orings and multiple parts. So looking over the Healthways catalogs I think what I have is the pressure tester AND the yoke adapter for the Airflo regulator. The catalog indicates that it is self bleading which is the reason I can't stop it from "leaking".
Now if I can find a reg at a reasonable price.