9 Apparatus for Analyzing Water, namely, pH meters; Water Meters; Heat Protection Apparatus, namely, thermostats for hot water heaters, Swimming Pool Equipment and Swimming Pool Accessories, namely, water Level Regulators, automatic Electrolytic Cells for Chlorinating Water; Electrical Apparatus for measuring and monitoring Quantity, Velocity, Pressure, Level, Temperature, Viscosity, Ion Concentration, Salinity and Radioactivity of swimming pool water, and parts therefor