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The 16555 includes calibration over the CSAT3, CSAT3A, CSAT3AH, CSAT3B, or CSAT3BH operating temperature range and coordinate measurement of transducer positions in space relative to the bubble mounting surface. A coordinate measurement machine (CMM) is used for this process. CMM measurement is performed on the anemometer at the time of original purchase. This recalibration option (instead of the CAL-CSAT3) is required if the geometry of the heads has changed since original manufacture. In all cases, factory recalibration requires an RMA (Returned Material Authorization).