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HM Digital Water Test Meters

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Founded in 1987, HM Digital is an OEM manufacturer internationally recognized for its high quality water testing products, including the industry leading TDS meter. HM Digital produces top quality water monitoring and testing equipment for water treatment and purification systems like reverse osmosis. Sold in over 50 countries, HM digital’s products help monitor and test for total dissolved solids (TDS).

Even the finest water purification systems available need to be tested and monitored to ensure TDS leaves to not become harmful. The EPA recommends a maximum TDS level of 500mg/L. A water testing and monitoring system can help you make sure your reverse osmosis or other water purification system has a high rejection rate.

From digital water tests meters and digital calibration solution to digital controllers and digital water test meters, Discount Filter Store has your water testing and monitoring needs covered. Additionally, Discount Filter Store offers digital sensors, digital sensor probes, and digital thermometers.


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  1. HM Digital ORP-STOR Electrode Storage Solution

    HM Digital ORP-STOR Electrode Storage Solution

    Can be used with the HM Digital ORP-200 and other ORP meters Learn More
    $7.99 MSRP:  $11.99
  2. SP-3 HM Digital Sensor Probe

    SP-3 HM Digital Sensor Probe

    Fits the HM Digital DM-2 Learn More
    $22.00 MSRP:  $23.81
  3. SP-2 HM Digital Sensor Probe

    SP-2 HM Digital Sensor Probe

    Fits the HM Digital DM-1 Learn More
    $14.29 MSRP:  $19.99
  4. SP-1-PSC HM Digital Sensor Probe

    SP-1-PSC HM Digital Sensor Probe

    Fits the HM Digital PSC-150, PSC-154, and CIC-152 Learn More
    $59.00 MSRP:  $59.97
  5. SP-1 HM Digital Sensor Probe

    SP-1 HM Digital Sensor Probe

    Fits the HM Digital PS-100, PC-100, PS-200, and PS-202 Learn More
    $59.69 MSRP:  $76.99
  6. SM-1 HM Digital Inline TDS Monitor
  7. QC-1 HM Digital Filter System Monitor
  8. PSC-154 HM Digital Controller

    PSC-154 HM Digital Controller

    $301.89 MSRP:  $376.99
  9. PSC-150 HM Digital Commercial Controller and Monitor
  10. SP-4 HM Digital Sensor Probe

    SP-4 HM Digital Sensor Probe

    Fits the HM Digital DM-1 Learn More
    $12.00 MSRP:  $13.79
  11. SP-5 HM Digital Sensor Probe

    SP-5 HM Digital Sensor Probe

    Fits the HM Digital DM-2 Learn More
    $11.00 MSRP:  $13.05
  12. TM-1 HM Digital Digital Thermometer

    TM-1 HM Digital Digital Thermometer

    $35.49 MSRP:  $45.99
  13. TDS-EZ HM Digital Water Test Meter

    TDS-EZ HM Digital Water Test Meter

    $19.95 MSRP:  $20.23
  14. TDS-4TM HM Digital Water Test Meter

    TDS-4TM HM Digital Water Test Meter

    $25.79 MSRP:  $33.99
  15. TDS-4 HM Digital Water Test Meter

    TDS-4 HM Digital Water Test Meter

    $23.79 MSRP:  $30.99
  16. TDS-3 HM Digital Water Test Meter

    TDS-3 HM Digital Water Test Meter

    $24.95 MSRP:  $27.83
  17. SP-P2 HM Digital Sensor

    SP-P2 HM Digital Sensor

    Fits the HM Digital PH-200 Learn More
    $44.95 MSRP:  $54.04
  18. SP-O2 HM Digital Sensor

    SP-O2 HM Digital Sensor

    Fits the HM Digital ORP-200 Learn More
    $55.59 MSRP:  $70.99
  19. SP-C1 HM Digital Sensor

    SP-C1 HM Digital Sensor

    Fits the HM Digital COM-100 Learn More
    $34.95 MSRP:  $36.79
  20. PS-202 HM Digital Controller
  21. PS-200 HM Digital Water Test Meter
  22. DM-1 HM Digital Inline Dual TDS Monitor

    DM-1 HM Digital Inline Dual TDS Monitor

    $44.49 MSRP:  $55.99
  23. COM-100 HM Digital Water Test Meter
  24. CIC-152 HM Digital Controller

    CIC-152 HM Digital Controller

    $348.00 MSRP:  $357.59
  25. CC-1 HM Digital Protective Cover - Clear

    CC-1 HM Digital Protective Cover - Clear

    Fits the HM Digital PS-100, PC-100, PS-200, PSC-150, PSC-154, and CIC-150 Learn More
    $29.95 MSRP:  $30.99

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