halocline
Contributor
It’s funny, I’ve been using an old SP SPG on my stage reg for years, because it has a knurled ring and is very easy to ID by touch. But it also reads about 10% high when full, and tapers down to accurate at about 600 PSI. Recently I ended up replacing it so that a teammate could also read it and know more accurately what’s in the stage.I still have an SPG that is always off by 50 bar. Perfectly usable in a pinch.
This is the beauty of SPGs, that decision cost me about $60.