I’ve spent a lot of time testing my well style manometer for EVAP testing and this what I came up with. It’s very accurate reading a .020 hole and that’s the number you need to know. And a way to make any manometer more accurate.
Regulator
https://www.amazon.com/MENSI-Pressure-Adjustable-Regulator-Connection/dp/B07GZNMS9S/ref=sr_1_1?keywords=MENSI+One+Pound+Propane+Tank+Low+Pressure+Adjustable+Gas+Regulator+with+1%2F4%E2%80%9D+Barb+Hose+Connection+%28Outlet+1%2F4%22+Barb%3D6.35MM%29&qid=1569794522&s=gateway&sr=8-1
Hose
https://www.amazon.com/GasOne-Propane-Adapter-Converter-Certified/dp/B073KV4WLJ
Clear PVC
https://www.homedepot.com/p/Formufit-1-2-in-x-5-ft-Furniture-Grade-Sch-40-PVC-Pipe-in-Clear-P012FGP-UV/206028369
