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RFO Types - Flow Rate Monitoring GEMS Sensors popularized the RotorFlow’s paddlewheel design by combining high visibility rotors with solid-state electronics that are packaged into compact, panel mounting housings. They provide accurate flow rate output with integral visual confirmation...all with an unprecedented price/performance ratio. 155421 - RFO-2500 Visual Flow Rate Indicator with Pulsed VDC Output, Polypropylene, 0.25" NPT Ports