All companies and institutions whatever the size should have a well documented plan for inspection of all safety equipment. Doing so will help to ensure such equipment is available to save lives when necessary and also to provide an audit trail in case of investigation following an incident.
Inspection should include ensuring correct positioning of equipment, suitable type for the fire hazards that are present as well as checking locking pins and anti-tamper seals. Any extinguisher that is pressurized with an indication gauge should be monitored for correct pressure. Checks for damage, leakage and corrosion should be made. The due service date should be checked to ensure extinguisher is in date.