What should you never attempt to do with a fire extinguisher?

Opening a fire extinguisher to check the contents is not advisable because doing so can compromise the device's integrity and safety. Fire extinguishers are pressurized containers filled with specific extinguishing agents, and tampering with them can potentially lead to improper operation or even accidental release of the agents. Manufacturers design fire extinguishers to be inspected externally for signs of damage or to check the pressure gauge without opening them, thus maintaining their functionality and safety. Regular inspections should be performed according to established guidelines, but these should always be done in a manner that ensures the extinguisher remains sealed and unaltered unless it is being serviced by a qualified professional.