Home / Products / Flow Flow Controllers, Fittings, Indicators, Monitors, Orifice Plates, Sensors, Switches, Totalizers, Transmitters, Water Meters, and Accessories for Flow Sight Flow Indicators Local visual indicators of flow rate. Mass Flowmeters and Controllers Sensors that indicate flow rate for low flow systems.Gas Flowmeter Selection Guide Flow Indicators / Controllers Remote flow indicators and controllers for use with flow transmitters. Flow Transmitters Sensors with an electrical transmission output for remote indication of flow rate. Flow Sensors Sensors for measuring flow rate. Flow Switches Sensors with an electrical contact output at a specific flow rate. Flowmeters Sensors that indicate flow rate. Water Meters Sensors that indicate flow totalization of water. Local and remote inidication models.