HI740220 are two replacement 25 mL glass vials with caps for the HI83749 Portable Turbidity and Bentocheck Meter. When determining the amount of bentonite fining reagent to add to a wine, four samples should be prepared in 25 mL glass vials. Each vial should contain a fixed amount of wine along with an increasing amount of bentonite suspension. After mixing and allowing to settle for 15 minutes, each sample can be filtered and the turbidity can be determined.