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They are inspected at least once a year. Inspections are random - and without warning.
About maybe twice a year
before and after
about twice a year
Daily
Very. Dept of weights & measures controls cheating & those that have edibles inspected by Health Dept.
before use
For fish tanks, weekly, at a minimum.
Every six months.
Every day
It depends upon what type of extinguisher it is. Many refillable types must be internally inspected on one-year intervals. Others only after 3, 5 or 6 years. NFPA 1 13.6.9 prescribes timetables for inspection, maintenance and recharging of portable fire extinguishers, for reference, although it is not universally adopted.
10 years