Sutro helps pool & spa owners with everything from testing to the administration of chemicals. Sutro is a beautiful, self-contained smart device that floats in your pool or spa & monitors your water chemistry 24/7. The limited release Alpha customer program is underway. Easy to understand alerts allow you to react quickly & intelligently to take control of your water. Sutro frees up your time & automates daily testing. It lives in your pool & provides continuous monitoring and reporting. It also tailors chemical dosages & tells you exactly what to add & when.