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The 16554 provides calibration over the CSAT3/A/B operating temperature range without using the coordinate measurement machine (CMM); the CMM is used on the CSAT3/A/B at time of original purchase. During recalibration, Campbell Scientific determines if the geometry of the heads has changed since original manufacture. If so, the 16555 Calibration with a CMM is required. In all cases, factory recalibration requires an RMA (Returned Material Authorization).