LabScience 30000-BTR Research Series Bottle Top Dispenser, 2.5-30mL Volume, 0.5mL Graduation, +/- 0.5 percent Accuracy Research series bottle top dispenser Bottle Top Dispenser designed with a smooth plunger movement for accurate and precise dispensing of liquids Easy to use with simple, quick volume adjustments Integral safety discharge system reduces risk of accidental dispensing and nozzle cap prevents dripping Easy to disassemble for cleaning and servicing