Anyone has this ? How do I use this?
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You use it to measure to find a good fit breast pump flange.

I know they I just don’t know how to use it. Like sound I pump then measure it because the nipple gets buggier. Because regular it says mines a 19 and it’s no way because my 21 feels too tight

Oh! No it's probably because of swelling but make sure you're measuring your nipple and not areola. Measure the diameter of your nipple, and round up to the nearest size of flange. If you're a 19 and you say 21 feels tight then try a 24.

Each pump might have their own sizing directions. Spectra is nipple size (mine were 18 and 19) plus 2-3, so I went with the 21mm flange

I use 25 and the lactation specialist said it looks to small. I have no clue what I’m doing.

You measure your nipple, add 2mm and that is your flange size. In my experience, lactation consultants don’t know much about pumping, just breastfeeding. Plus, you may have elastic nipples, which there are different flanges for.
https://youtu.be/a5OQXkdnW3E?si=eY3w2KtXXPpQ9GaH

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