Annual servicing of a hand portable CO2 fire extinguisher includes __________.

Correct Answer: Option C — weighing the cylinder and recharging if weight loss exceeds 10% of the weight of the charge

NFPA 10, incorporated by reference in 46 CFR, mandates that hand-portable CO2 extinguishers be weighed annually. If the agent weight loss exceeds 10% of the original charge, the cylinder must be recharged. This ensures the extinguisher maintains sufficient capacity to meet its rated fire-fighting performance during an emergency.