This closed system is designed to avoid external contamination. Rugged, borosilicate self-zeroing glass burets with 0.1mL markings in white are attached to a polyethylene screw closure and bottle. Manually pressing the soft bottle propels fluid into the buret. Overflow returns to the bottle if pressure is no longer applied to the bottle. A glass stopcock with a 2mm bore is located on the drain arm. Large, detachable plastic base may be removed from the reservoir. Accuracy of burette is within 1% of total volume.