Custom 13/415 Aluminum rubber head glass dropper

    Attention should also be paid to the use of the rubber Aluminum Dropper: when sucking liquid, squeeze the rubber-tipped dropper with your thumb and forefinger to drive away the air in the Aluminum dropper, then put the glass tube nozzle into the essence, let go of your thumb and forefinger, and the essence will be sucked, and then lift the Glass Pipette Dropper. Avoid squeezing the rubber head in the liquid to avoid frequent air pollution. After absorbing the liquid, the glue head must be upward, not flat, and the opening of the glass tip should not be upward to avoid the glue head from being corroded; You can't put the Aluminum Medicine Droppers flat on the table after sucking the liquid, so as not to contaminate the dropper.