RAG R30: Pulse Head & Disc Test Unit (RTU 1000) with adjustable speed rotating magnet. Also has 4 pin Mil connector input with LED to indicate pluses generated. Requires a Flow sensor (LRP or PD100 etc) to fit on top of the rotating magnet to generate pulses.
RAG R31: Pulse Generating Test Unit (RTU 1001), with a fixed 2 Hz output. RAG R32: Pulse Indicating Test Unit (RTU 1002) with LED to indicate pulse input. Can simultaneously be connected to Logger.