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fire extinguisher pressure gauge

Why CO2 fire extinguisher does not have a pressure gauge?

The pressure gauge is one of the parts seen in most fire extinguishers. For example, The pressure gauge is available in DCP and water fire extinguishers, but in CO2 fire extinguishers, the pressure gauge is unavailable. You’ll be wondering why was it possible. There are possible reasons why the pressure gauge is unavailable in Co2 portable fire extinguishers.