What is a key indicator of a properly charged fire extinguisher?

A properly charged fire extinguisher is indicated by the pressure gauge needle being in the green zone. The pressure gauge is designed to show whether the extinguisher is adequately pressurized. When the needle is in the green zone, it indicates that the fire extinguisher is ready for use and has sufficient pressure to effectively discharge its agent when needed. Maintaining the correct pressure is crucial for the performance of the extinguisher; if it falls outside the green zone, it could mean the extinguisher is either undercharged or overcharged, leading to potential failure during an emergency.

In contrast, a lightweight feel could suggest that the extinguisher is undercharged or empty; an inspection tag being dated is important for maintenance records but does not directly indicate the charge status; and a handle that is hot to the touch raises concerns about overheating or an incorrect location, neither of which informs about the charge status of the extinguisher.