The calibration drift check of a water quality monitor sensor for turbidity, during a site visit. The Code indicating whether the reading is for calibration or recalibration. The date and time of the turbidity check or calibration reading. The theoretical value of the standard solution, in units of the parameter. The code identifying the type of the standard, KCl or NaCl. The lot number of the standard solution. The expiration date of the standard solution. Was this this reading for the conductance standard that was used for recalibration? The temperature during the turbidity check or calibration, in degrees celsius. The turbidity read during the turbidity check or calibration, in units defined by the sensor. The percent error between the turbidity standard and the turbidity reading.