Monthly Visual Inspection.

Check for any sign of tampering. This may be missing or broken tamper tags or pins. Look for any signs of discharge. This may be water, powder or foam traces on the hose or horn of the extinguisher. Gauges showing low or high pressure (usually indicated by red).
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Any damage to fire extinguishers, rust, dents, missing parts etc. Workplaces with a high risk of damage to their fire extinguishers such as those kept on haulage vehicles should be particularly vigilant. Any damaged extinguishers must be replaced immediately or repaired by a servicing company.