I have Agleader monitor, which I am sure uses the same calibration method as the AFS. Be sure to understand at different flow rates ( minimum 4 load and better 6-8 at different field speeds os similar grain (2.5 MPH, 3,3.5, 4.0 etc.) and then repeat a few to see how close. Speeds should be above and below what you normally harvest. Also, be sure the vibration calibration is set properly for each crop- simple takes about 2 minutes total. The SMS software from Al is simple to learn. I use Mapshots easisuite. Both have websites.