Hi @vtyler98 . Appreciate the report! The CL system for UV requires a number of days with clear skies, especially during solar noon where we can compare daily max UV versus your SKY’s reported UV values in order to calibrate in-situ. We looked at your data. So far, only two days have qualified as valid clear days : 11 Dec and 17 Dec. Once the system can evaluate a few more days, it will automatically calibrate your UV sensor. Then it will rerun the data every day to ensure all data is precisely calibrated forever.