So I followed the advice of some old posts here about doing a compression test on my 6.9 and ordered a Star Products 15-53: Star Products TU-15-53 Compression Tester - Compression / Press Test

I just got it tonight and when I opened it up I noticed that the gauge doesn't read zero. I've put a picture on this link: https://plus.google.com/photos/10923...Knorc-kwIOU7gE

Is there an adjustment that I need to do or should I just RMA it?

 

Did you hit the pressure release?

 

Yep, no movement, no hissing.

 

So I am going to return this tester, do people think I should try another of that same item or request a refund and get a different tester? If I get a different tester, do people have an recommendations on which to get?