When Almen Gauge was calibrated by the agency, they changed the head. They gave a certification of calibration along with a certification for the new head. The due date for the next calibration for the Almen Gauge was January 20, 2010 but the certification for the head said the head was calibrated on August 17, 2008 at the time of the exwork from the plant. Does it mean the calibration for the head will expire before the due date for the next calibration of the almen gauge?