Typically, Sea-Bird can calibrate the instrument and perform minor repairs within 3 - 4 weeks, plus shipping time. However, this may vary, depending on current backlog. Before shipping an instrument to us, go to our Online RMA and Service Request Form page to obtain an RMA number, so that we know your instrument is on the way and can schedule appropriately. If time is critical, contact us before shipping to verify that we can meet your schedule. Notes: The typical 3 - 4 week turnaround does not apply to recalibrating / repairing auxiliary sensors produced by other manufacturers. Recalibration / repair of these sensors must be performed by the manufacturers.  Sea-Bird opened a calibration and repair center in Germany in 2011, which can provide faster shipping for European customers.