【Bottle Top Dispenser】Accurate clear scale with clear printing, smooth piston movement, and tight sealing. Delivers reliable, repeatable liquid dispensing with minimal error, perfect for quantitative liquid addition in labs 【Glass Bottle】High-quality borosilicate glass structure, low expansion coefficient, high temperature resistance and chemical stability. Can withstand large temperature differences, ensuring long-term durability 【Professional Piston Design】Designed for low-intensity operation and smooth plunger movement; when the dispenser is not in use for a short period of time, the discharge tube cap prevents leakage 【Wide Compatibility】Equipped with 5 standard threaded adapters (GL25/28/32/38/45), fits most reagent bottles in the lab. Secure sealing prevents leakage, ensuring safe and stable liquid transfer 【Versatile & Complete Specifications】Available in multiple bottle set options (250ml/500ml/1000ml/2000ml transparent bottles), suitable for petrochemical, pharmaceutical, metallurgy, scientific research and other industries