Calibration of an equipment is an well defined activity to be done at regular interval may be once in a year or half yearly even quarterly to ensure that all the components of equipment are working fine and are as a whole equipment is been capable of producing precised and accurate results each and every time.Apart from defined frequency after any major servicing or maintenance if equipment or in case of wrong suspected results produced by equipment;the calibration has to be done.
Verification is somewhat a reassuring kind of activity to be done on daily basis most commonly...giving the assurance that after calibration still the equipment is working fine and if any problem arise in equipment that vll be identified and sorted out at very initial stage....
