Comprising U-shaped glass tube of about 15mm diameter, with one plain arm 220mm long and other arm of length and 20mm with graduations from 25 to 35 × 0.2mL terminating in a bulb of dia 37mm. A third limb about 185 × 6mm is attached at right angles to the U tube. A short glass tube is located on the top of open end of U tube through rubber stopper with its other end having rubber tube & pinch clip. Completely contained in a tall form beaker of 1000/2000mL capacity stirrer. All glass parts of borosilicate glass