Inspect Extinguishers

Know the locations of the fire extinguishers in your area and make sure they are in the designated place.
Make sure the type of extinguisher is safe to use on fires likely to occur in the immediate area.
Make sure the extinguisher is not obstructed to access or visibility.
Make sure the operating instructions on the nameplate are legible and facing outward.
Make sure the safety seal or tamper indicator is not broken or missing.
Make sure the extinguisher feels full by lifting or "hefting"
Examine for any obvious physical damage.
Make sure the pressure gauge or indicator is in the operable range or position.

All Portable Fire Extinguishers should be maintained annually by a qualified and trained fire extinguisher service agency.
In California, fire extinguisher service companies and technicians are required to be licensed by the State Fire Marshal and all service procedures are to be in accordance with the California Code of Regulations, Title 19, Chapter 3.