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Daily
before use
For fish tanks, weekly, at a minimum.
The whole vehicle should have a safety inspection every service.
Fire extinguishers should be inspected annually - by a suitably qualified person.
The error rate is less taht 1%. You should have your valves inspected often.
Radiator hoses and heater hoses should be inspected yearly and replaced when neccessary.
The contents of any emergency kit should be routinely inspected, depending on the anticipated necessity and/or the current disaster "season." Depending on where you are, it should be inspected and replenished every 6-15 months, if not more frequently.
They are inspected at least once a year. Inspections are random - and without warning.
about twice a year
About maybe twice a year
before and after