Review on Moroso 62388 Valve Pressure Tester by Matthew Rodenbaugh

The tester works fine but it really needs some kind of calibration mechanism. Without a test spring of known pressure to calibrate this tool, all you can do is hope that all springs perform the same. The product documentation says it should be calibrated with a known pre-calibrated spring, but if I had a calibrated tester in my toolbox I wouldn't need it. I had to bite the bullet, buy an exact desktop model and be done with it.