Why you need Calibration? Every 3 year, R graders need to attend the calibration test to make sure cuppers still have the professional ability to evalute coffee. All students that pass extend the certification for 3 more years!
Calibration Requirement: Cup 3 flights of coffee，at least pass 2 flights
If you get your R certificate from Apr. 2016 to Apr. 2017 you should attend the Calibration!