I meant the cheaply priced regulators where you can get a dual guage regulator with solenoid value for $100-$170.
I would avoid those "all in one" packages (usually made in China, etc...)
Some people have OK luck with them, others, not so much so.
They use BS standard connections here. Can't find a solenoid valve here of metering needle here will probably order online. Any recommendations? Solenoid dependable one. Metering needle to improve the accuracy of the C mode.
There are some good solenoid valves and metering valves online, but they all use NPT standard.
You will need the needle/metering valve at the very least. A solenoid can be handy if you want the CO2 on a timer/pH controller.