United brand bottle top dispensers offer high accuracy at economical prices. Each dispenser is individually calibrated and certified in an ISO 17025 accredited laboratory in accordance with ISO 8655 standards. Five adapters are included with each unit for use with a wide range of bottle sizes. All wetted parts are made from PTFE and borosilicate glass for maximum chemical resistance. These easy-to-use instruments are suitable for all laboratory applications except HF. Special precautions must be taken for use, cleaning, and storage when working with concentrated fuming acids. A factory calibration certificate is provided with each bottle top dispenser. Dispensers are easy to disassemble and can be recalibrated in the lab. Fully autoclavable at 121°C, 15 psi for 10 to 15 minutes.