Based on my experience, these pipettes are a complete waste of money. The plastic material is flimsy and they leak like crazy. I tried using them for a lab experiment, and ended up having to toss them in the trash. The only positive thing I can say is that they are cheap, but you get what you pay for. Overall, I would not recommend these pipettes to anyone in the Industrial and Scientific field. Save your money and invest in a better quality product.
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