One Drop is a pool and hot tub chemical measurer that allows the user to accurately measure pH levels and measure the amount of chemicals needed to add into a pool or hot tub. When paired with the app, it lessens the cognitive load of having to calculate how much chemical they need to put into their pool — the app has a calculator that can accommodate different volumes of pools or hot tubs, and different types of chemicals whether it be a powder or a liquid. The app cues the user on how much more of a chemical they still need to add, and when they have added the complete amount.

SolidWorks rendering of product and app interface in Adobe Illustrator.