Ian Mather wrote:

From what I've heard, the single gauges aren't recomended. People seem to
recommend a double gauge so that you can monitor CO2 output as well as how
much CO2 is left in your bottle.

As long as there is any liquid CO2 in the bottle, the pressure will be strictly
a function of temperature. The best way to monitor the volume of CO2 in the
bottle is to put it on a scale.


--

Scott Lewis