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They are very leaky. If you’re transferring a thick liquid you’ll probably be fine. The measurements are not accurate there is approximately 5ml of space at the mouth of the syringe that you need to account for
I use these every single day. Once a day. And after only about 30 days of use now the plunger is not as tight. It slides about more freely and thats not good when you're trying to measure liquids accurately. I do like these syringes though.