When checking firefighting equipment, what would you check to ensure a fire extinguisher is fully charged?

To determine whether a fire extinguisher is fully charged, the pressure gauge provides key information. The gauge typically has markings that indicate whether the pressure is within the acceptable operating range. If the needle is in the green zone, this indicates the extinguisher is properly charged and ready for use. A reading in the red zone, either too low or too high, signals that the extinguisher may not function effectively in an emergency situation.

The other options, such as hoses and hose equipment, the sprinkler system main valve, and water supply valves, are important components of fire protection systems, but they are not directly related to the status of an individual fire extinguisher. These elements play different roles in fire safety and response, but they do not provide the necessary confirmation of an extinguisher's charge status. Focusing on the pressure gauge is essential for ensuring that the extinguisher is capable of performing its intended function when needed.