Nipple Measuring Ruler for Flange Sizing

This nipple measuring tool is a compact, flat plastic card designed to determine optimal breast pump flange size by measuring nipple diameter. It measures 27 distinct circular openings ranging from 12 mm to 38 mm in 1 mm increments. Made from food-grade, wear-resistant plastic, it is smooth, lightweight, and safe for sensitive skin. The ruler features clear, permanent printed scales with no moving parts or electronics. Ideal for new mothers seeking accurate, repeatable measurements before selecting or adjusting flanges — especially helpful during postpartum nipple size changes.