What is the primary function of the pressure gauge on a fire extinguisher?

The primary function of the pressure gauge on a fire extinguisher is to indicate whether the extinguisher is properly pressurized. The gauge typically includes a color-coded zone that shows whether the pressure is in the optimal range, too low, or too high. Proper pressure is critical for ensuring that the fire extinguisher will operate effectively when needed. If the gauge shows that the pressure is insufficient, it signals that the extinguisher may not function correctly and requires service or replacement. This feature is essential because having a properly pressurized extinguisher is a key factor in fire safety, potentially determining how well it can discharge its contents to suppress a fire.

While other options mention aspects such as the type of extinguisher, duration of use, and inspection dates, these are not the primary purpose of the pressure gauge. Instead, the gauge's sole focus is on the readiness of the extinguisher based on its internal pressure.