I bought this to measure small amounts of liquid that I wanted to be accurate. The rubber ball is detachable so you can clean it and the dropper body, which is nice. When you fully squeeze the balloon and suck up liquid, it fills up to the 1mL mark almost every time, which is good for speed. If you try to draw something at an angle, that's the only time it can exceed 1ml. Overall I like it and would definitely recommend it if you want a washable, mostly accurate eyedropper. If you need extreme accuracy, look elsewhere.
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