The HM Digital TRM-1 reads three points in one system from a single display — the case for it is a multi-stage train, such as RO followed by DI, where knowing the reading between stages tells you which stage has drifted rather than just that something has.
A slide switch selects LINE 1, 2 or 3 — HM Digital's own example wires Line 1 (red) to the feed, Line 2 (blue) after the RO membrane and Line 3 (green) after the DI stage. Range to 9990 ppm, battery powered, and small enough to mount on the system itself. Note that all three sensors must be calibrated together.
Specifications transcribed from the HM Digital TRM-1 User’s Guide Ver 2.4E.
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1 Year Limited Warranty, HM Digital, Inc.
