I aint CPV see in it?
sure, it flutters, a digital doesnt bounce around either? 🙄 used it a couple weeks ago on a tankless on a code 12. discovered the flame rod and ignition gasket was half gone from whatever last dipshit serviced it. it gets used pretty often throughout the year, there's quite a few plumbers who install gas piping and are using NG regulators on LP appliances because they just say "regulator" at the counter. They assume one for all and all for one. Hasn't ever failed me. It's ok not to understand my flawless methods.🤟Ok sure.
Those are spring type gauges and they’re very unreliable. The worst sold, look it up for yourself
But besides that, the needle flutters and you can’t get an accurate reading when troubleshooting when the unit is operating and modulating the gas valves.