Get Correct Flange SizeThe flare size of the breast pump is critical during breastfeeding. Improperly sized flare can reduce a mom's breast pumping comfort and efficiency. This nipple ruler helps you determine the correct nipple shield quickly and give you a better breastfeeding experience.<br><br>Accurate &amp; Fast MeasureUse the scale on the edge or place nipple into the suitable hole to measure, the nipple rule provides accurate measurements include 11 nipple measurement holes from 14 mm to 30 mm, easy to read.<br><br>Sizing is an "art"Based on nipple elasticity, you may need to size down if you have elastic nipples, or size up if you have less elastic nipples. If you feel discomfort or experience consistently reduced volume, you may need to try different sizes.<br><br>Perfect GiftA must have and great gift for new moms! Let moms to find the right flange and enjoy breastfeeding.