HM Digital (PM-2) External In-Line TDS Purity Monitor 1-4" Quick ConnectHM Digital Water Quality Meters HM Digital PM 2 External In Line TDS Purity Monitor Continuous monitoring with programmable alerts for any water purification system using 1 4" quick connect fittings 0 200 ppm Range Audible & Visual Alerts User Defined Set Points Factory Calibrated The HM Digital PM 2 monitors total dissolved solids in real time and alerts you when your RO membrane or DI resin needs replacement. With a 0 200 ppm measurement range and
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