The Sutro Smart Pool Monitor takes the guesswork out of managing your pool. With this one device, you’ll know your pool’s pH, free chlorine ppm, temperature, and alkalinity. This pool manager connects to the Sutro app, where you’ll have all the information you need in one spot. The smart pool app easily and clearly displays the measurements it receives from the Sutro in your pool. And because this pool pH monitor has a 100-foot range, you don’t need to be right next to it to receive these measurements. Furthermore, this smart pool device even works when you have a pool cover on, which means it’s an all-season monitor. If you want to use the Sutro in your hot tub—go ahead. It can easily withstand the heat from your spa. Because the batteries last at least 30 days, you’ll have to recharge it only a few times each season.