Plus is the most advanced bottle top dispenser designed following years of research this next generation dispenser is highly robust and reliable. Plus has a recirculation value for redirecting the liquid into the bottle for bubble free dispensing without any loss of reagent. This Bottle Top Dispenser is made of Borosilicate Glass and has a smooth and soft plunger for easy working in difficult laboratory conditions. • Adjustment Knob (PP) 180º Rotation • Fully Autoclavable • Light weight and easy to use • Accuracy and Reproducibility According to ISO 8655