How to use the dropper

1. When using the dropper, pinch the rubber nipple tightly with your fingers to drive out the air in the dropper, then put the dropper into the reagent bottle, let go of your finger, and the reagent will be inhaled.
2. After taking the liquid, the dropper should keep the rubber head above, and do not lay it flat or upside down to prevent the solution from flowing back and corroding the rubber head.
3. When dropping the liquid, it should be suspended above the beaker, do not touch the wall of the beaker, so as not to stain the dropper or cause contamination of the reagent.
4. Do not put the dropper on the test bench or other places, so as not to stain the dropper.
5. The used dropper should be rinsed with clean water immediately for reuse.
6. It is strictly forbidden to use the dropper that has not been cleaned to draw other reagents (the dropper on the dropper bottle should not be rinsed with water).