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...Calibration of timers approval date mar version review owner caroline troy introduction to ensure that the are working properly they must be operated alongside a calibrated timer on an annual basis designated for this purpose and against speaking clock or reliable website such as www greenwichmeantime com annually requirements reference telephone internet connection work instruction by comparing time source periods chosen user logged form over relevant equipment will tested it is tester s responsibility any has been at level appropriate their individual needs if does not correspond with downgraded disposed set normal period use count down both should then going simultaneously result acceptable tolerance decided lab users no change made name updated document created...