10ML Glass Graduated Droppers Pipettes Dropping Pipettes Fluid and Liquid Pipettors with Big Rubber Caps 4 Pcs

The rubber glass pipette is environmental friendly and non-toxic. It is also reusable after clean up,and better than plastic pipette. Apply for testing laboratories, chemistry, microbiology, liquids, scents. Instructions?When adding the product, the dropper is just above the vertical. After drawing the liquid, the tip can not touch other objects, so as to avoid contamination of impurities. When used, do not only use the thumb and index finger pinching, with the middle finger and ring finger together. Our guarantee:Customer satisfaction is our compliance,any trouble please contact us to get a pleased answer