9 Sensors for measuring pH/ORP levels in liquids, electrical conductivity of liquids, oxygen concentration of liquids, turbidity of liquids, solid concentration in liquids, chlorine concentration in liquids, chlorine dioxide concentration in liquids, and bromine concentration in liquids; Multi-parameter digital transmitters for measuring, monitoring, and controlling pH/ORP levels in liquids, electrical conductivity of liquids, oxygen concentration of liquids, turbidity of liquids, solid concentration in liquids, chlorine concentration in liquids, chlorine dioxide concentration in liquids, and bromine concentration in liquids