9 Solenoid valves for liquids; electrical control equipment for valves and valve combinations, in particular for valves and valve combinations including solenoids; electrical appliances to control flow rates, namely, sensors and detectors for measuring pressure, temperature, conductance, water level, pH value, distance, flow rate, levelness, density, surface tension, viscosity, and hardness of liquids, not for medical use, hall sensors for measuring pressure, temperature, conductance, water level, pH value, distance, flow rate, levelness, density, surface tension, viscosity, and hardness of liquids, not for medical use, calorimetric sensors, and measuring sensors for measuring pressure, temperature, conductance, water level, pH value, distance, flow rate, levelness, density, surface tension, viscosity, and hardness of liquids, not for medical use; flow meters and pressure gauges for liquids