Its hard to say. Some regulators come with dual gauges to see the pressure in the tank and that can give you a good idea of how much you have left. The regulators that do not have dual gauges you will have to watch. I did see a sticker type device that you can use on propain tanks I wonder if you could use it on a Co2 tank. Both are liquid and cool so I dont see why not. I might have to try that to see if it will work.
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Trying to keep the fish hoddy alive......
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