High quality: made of non-toxic plastic, will not harm fish. There are 4 scales on the pipeline: 10ML, 15ML, 20ML, 30ML Keep the fish tank clean: The fish tank dropper can remove residual dirt and food on the bottom of the fish tank. Easy to use: The amount of water absorbed by the dropper can be adjusted by controlling the handle at the end of the dropper. Clean the product before use. Wide range of uses: The pipette dropper is also suitable for frozen food for shrimp and red worms after food has been frozen, as well as for live food or small liquid food.