The first one I bought (Proform 0-300# or something comparable?) was a piece of junk. I also have a claibration spring and it was nowhere near accurate. IIRC, it started off OK, then started getting more "off" after using it only a few times.
The second one I bought was a 0-600# from a board member (vendor) whose name I cannot recall at the moment, unfortunately. That one has worked fine. Maybe he'll see this thread and pipe in.
That brings up a good question,i was looking at a proform 0-700 unit.witch one are you guys usin?
I have the 300and the 700.. they are both the same
but a different gauge on it... I also have a 1000
psi gauge that I screwed on to one for testing the
open pressure on my W-9 heads.. 900# springs
