The HI83749 is a portable turbidity meter for the monitoring of protein stability and bentonite in wine. The meter is supplied complete with bentocheck reagent and AMCO-AEPA-1 primary turbidity standards. The bentocheck reagent is used to determine the amount of bentonite required to increase protein stability and the AMCO-AEPA-1 primary turbidity standards are used for calibration and performance verification of the meter.