A professional who repairs and tests fire extinguishers in repair shops and in establishments, such as factories, homes, garages, and office buildings, using handtools and hydrostatic test equipment. Responsibilities include:

• Dismantles extinguisher and examines tubings, horns, head gaskets, cutter discs, and other parts for defects.
• Replaces worn or damaged parts, using handtools.
• Cleans extinguishers and recharges them with materials, such as soda water and sulfuric acid, carbon tetrachloride, nitrogen, or patented solutions.
• Tests extinguishers for conformity with legal specifications, using hydrostatic test equipment.
• May install cabinets and brackets to hold extinguishers.
• May sell fire extinguishers.