1ml Glass Pipette Dropper Graduated Eye Dropper for Liquid Medicine Essential Oil Laboratory, 20 Pack...

Overall these are good droppers. The markings are clear and easy to read. I soaked it in acetone for 5 minutes and the markings came out with no issues. Testing with a 5ml graduated cylender, it appears that the dropper is about +0.1ml across it's entire range. I suspect they didn't account for the taper at the bottom when marking it. It's a dropper not a qualitative piece of glassware so that's fine. You can compensate for this by using the top instead of the bottom of the meniscus. The bulb is soft and easy to use. However it does not have the capacity to pull a full 1ml into the dropper. If you need about 0.75ml, you will need to tilt and draw up a 2nd squeeze. Fine for water based liquids but not great for the life of the bulb with some stronger solvents.

Great quality

I hadn't realised when I purchased these pipettes that the bulb is designed to fit in the hole of a dropper bottle's lid. I don't need to do that, but thought that it was interesting that I can if I want to. Bought to replace previous dropper that has had the markings wear off from use. That will happen with these, too, but since I use them only one at a time, I should be good for at least 20 years. It takes about a year of daily use to wear the numbers off.

Needed something that I could use with essential oils that didnt come with a dropper - great packaging and quality - would purchase from again

Very easy to read, great suction, I am very happy with my purchase. I use these all the time, and they are super easy to clean, and also dry quickly.