Nipple Diameter Measuring Tool

Created a simple measuring tool for my wife and some of her friends so that they could measure their nipple size for breast pump sizing. 

This helped them figure out that they needed bigger or small adapters for their breast pumps, they had less discomfort with the proper sizing.

You can also use it to measure other round things if you want.

You can change the color of the last layer to get the same effect as in the picture.