The 33267 retesting must be purchased in conjunction with the 33266 Recalibration. The 33266 provides recalibration of the CR1000X to meet original specifications. The 33267 process includes retesting at the CR1000X extended temperature range (-55° to +85°C). Retesting at the extended temperature range is only available for a CR1000X that previously passed the extended temperature testing. An RMA (Returned Material Authorization) from Campbell Scientific is required.