PF2W3 is a monitor with display for the PF2W5 remote flow sensors.  PF2W is a legacy series refreshed in 2009 as PF3W.  Please consider the newer products for your applications.  The sensor and monitor can be located up to 3m apart using PF2A5's optional cable.  The red 3-digit LED display can show instantaneous or accumulated flow.  2 NPN or PNP switch outputs are included, with an LED indicator