When adding drops, the dropper should be kept straight above the container, avoid tilting, do not stand upside down, do not reach into the container, and do not touch the container wall. In addition to suction solution, tube tip should not touch other utensils, so as to avoid contamination of impurities. Do not use one pipe and two.
The general dropper needs to be cleaned after use, while the special dropper can't be cleaned. The special dropper needs to be put back into the original reagent bottle after use.
When using, do not use only the thumb and index finger pinched, with the middle finger and ring finger between.
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