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Same here, the fire extinguisher folks are great and know what they are doing. They will even set you up with a used tank for less money than most other places.

Pressure shortly after a refill is subject to many variables such as temperature and so forth. Your best bet is to place the tank on a scale and monitor the weight for a week or so. That of course is IF you shake it and it feels like it's full of liquid, if not, then it wasn't filled. Make sure they know what it's for, with fire extinguishers used to extinguish fires, the tanks are not filled with liquid CO2 because they need to be filled with the liquid that is used to put out the fire. CO2 is only used to propel the contents out so it's only present in a small percentage of the total contents. In our case, we want all CO2 in there so they need to know that.

Hope that helps
Giancarlo Podio
 
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