Bottle Top Dispenser is designed through years of research to be both robust and reliable. This Borosilicate Glass Bottle Top Dispenser utilizes 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 • Excellent with all reagents except HF