YU SHUO DA manual single channel pipette pump is a color-coded laboratory pipette aid built for one-hand liquid transfer with plastic and glass pipettes. A side wheel controls aspiration and dispensing, and the side lever empties the pipette completely for accurate reagent addition and sample transfer. Four color-coded volumes cover 2 mL, 5 mL, 10 mL and 25 mL, and the plastic body resists acids and alkalis for daily laboratory use. OEM custom color selection and custom packaging are available.