pH measuring devices for use with water and aqueous solutions, as well as parts and accessories therefor, namely, pH probe tip reference electrodes, pH probe tip measuring electrodes, pH probe tips including an electrode assembly, pH double junction pH probe cells including electrode assemblies, calibration free pH probe tips including an electrode assembly, single use probe tips including an electrode assembly, and replaceable reference junctions; devices for measuring, monitoring, or logging the physical parameters of water or aqueous solutions, namely, conductivity meters, pH meters, ORP (oxidation reduction potential) meters, redox meters, dissolved oxygen meters, moisture meters, ion selective meters, chlorine meters and equipment capable of receiving and logging data information from the aforesaid meters, namely, data loggers and data capture cards for computers; control devices for monitoring water and aqueous solutions, and for controlling the dosing of additives thereto, namely, dose controllers, and dose control monitors; control devices monitoring water and aqueous solutions, and for controlling equipment maintaining monitored characteristics of the water or aqueous solution within defined limits, namely, conductivity controllers, pH controllers, ORP controllers, redox controllers, dissolved oxygen controllers, moisture controllers, ion selective controllers, chlorine controllers, and probe monitoring controllers; electronic power controllers for water heating elements; solenoid valves