Although doing your own independent visual inspections can be highly-beneficial, sourcing professional fire extinguisher inspection services at least once a year can help ensure your unit is working, beyond any obvious faults. Professionals in the field will be able to identify potential issues before they arise, and make the necessary fixes and improvements proactively. Along with a physical inspection using specialized tools, this can help greatly improve the overall longevity of your fire extinguisher. A properly maintained fire extinguisher can last upwards of 10 years of reliable use.