The 16550 requires an RMA (Returned Material Authorization) from Campbell Scientific. When the 16550 is ordered, the CR7 is recalibrated to meet original specifications. Recalibration includes standard temperature testing (-25° to 50°C). Before and after calibration sheets are supplied with the datalogger. The calibration price assumes return of a fully functional datalogger; charges for all repairs will be added to the invoice.