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The 16554 provides calibration over the CSAT3, CSAT3A, CSAT3AH, CSAT3B, or CSAT3BH operating temperature range without using the coordinate measurement machine (CMM); the CMM is used on the anemometer at the 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).