How Full Is The Tank?

Yo

I am hoping somone can help me try and determine an easy way to figure out how much co2 is left in my tank. I have a hydrofarm regulator .2-2 and there is only one pressure gauge and it is for the flow. They is no way to know how much is left. it just runs out. I have used the Weighing it method but even that seems to be inaccurate. Does anyone know of a meter that can be attached to tell me or is this not possible?? Thanks for your time

i have a co2 generator...that use's propane..but..i know regulators are made for tanks that have one gauge for the tank..that measure's existing pressure in the tank..and the other gauge that regulates the flow out of the tank...you see them all the time in oxy acetinline cuting torch rigs..and also in nitrogen regulators..someone would make a gauge that would be like that for your co2 tank..id check ebay...

there is what you are looking for i think...

Milwaukee SMS122+MA957 / pH Controller + CO2 Regulator - eBay (item 370110960520 end time Dec-10-08 07:45:59 PST) here is another one..