Koolance's stainless steel and brass inline flow meter provides electronic indication of real-time coolant flow rate. Uses G 1/4 BSP threads. A frequency circuit (sold separately) multiplies the RPM signal to allow it to be read by most fan tachometer headers (such as those found on ATX motherboards). This signal is intended to allow fan detection software (including BIOS) to enable the appropriate alarm or shutdown procedure if the flow meter impeller stops rotating. The "RPMs" represent approx