Dosing with reagent re circulation system for manual dosing directly from the reagent bottle. Available in six different volumes. The stages gauge and digital volumetric adjustment ensure a consistently accurate and operator-independent, reproducible volume delivery. The metering of high purity alumina ceramic and the DURAN ® glass cylinder ensure maximum chemical and thermal resistance. The high-quality materials of all parts carrying media enable the use of ceramus ® at a temperature range from 4 ° C to 50 ° C use. It has a media re-circulation system for quick and easy ventilation without loss of reagent . As ceramus ® HF is also a special version for dosing very aggressive media available. Piston and cylinder are made of high-purity alumina ceramic, valve seats and ceramic balls, valve springs made of platinum / iridium.