The organo 525 model features a ground glass plunger, making it ideal for organics, and noncrystallizing acid and base solutions. A built-in calibration system, hidden under the cap, allows for simple adjustment to accurately accommodate solutions due to varying viscosity or temperature. Two volume adjustment knobs are included—use the premounted slider when changing dispensing volumes frequently or the screw-type version for a more permanent setting without the risk of accidental changes.