PHBOT is an analyser for indoor and outdoor home pool owners, professionals in public pools, controllers of swimming pools with automatic dosage systems and many others who need to maintain the pH, concentration of free chlorine and combined available chlorine within the recommended ranges. It is an elegant smartphone add-on complete with an installed application that graphically represents the measured values. All the data are backed up to a cloud available in other users’ smart devices and in a web application on any desktop computer with Windows or iOS.