Those who are privileged enough to have a backyard swimming pool ought to check their pH and chlorine levels often, assuming they aren’t running on a saltwater system. Instead of taking the manual route, why not install the Wireless Pool Monitoring System instead? This system comes with a sensor pod that floats feely in your pool, taking measurements constantly always at an 18″ depth, sending its results to a wireless controller within a 150 foot radius. These results will then let you know whether you need to add any more chemicals to maintain a 7.2 pH reading. The sensor pod is powered by a D battery that lasts up to a year before running out of juice. The Wireless Pool Monitoring System retails for $399.95.