The best way to calculate how much nitrous in a bottle is to weight it using a precision scale.
00-68000-C Nitrous Outlet Digital Nitrous Scale LCD Display Up To 440 LBS KG OZ
Nitrous Express Digital Nitrous Weight Scale NX-15907
Digital Nitrous Oxide Pressure Gauge
00-63002 Nitrous Outlet Digital 2 1/16" Dia. Nitrous Pressure Gauge 0-1500 PSI
18961 Nitrous Express Digital RPM Activated Window Switch Adjustable Screen
N3211 Digital RPM 3 Mode Window Switch By Intellitronix 3 Limits Nitrous
