Sprayer Calibration Watch the Sprayer Calibration video (~50 minutes) then pass the MBPC License Recertification Credits Test with at least 80% to earn one (1) recertification credit. Test results will be forwarded to the Maine Board of Pesticides Control. Video: Sprayer Calibration Review (YouTube) https://youtu.be/KElqWpybRp8 Take the Quiz MBPC License Recertification Credits Test: Sprayer Calibration Please