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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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  • HM Digital ORP-STOR Electrode Storage Solution

    HM Digital ORP-STOR Electrode Storage Solution

    $7.99
    MSRP: $11.99
    Save 33%
  • SP-3 HM Digital Sensor Probe

    SP-3 HM Digital Sensor Probe

    $22.00
    MSRP: $23.81
    Save 8%
  • SP-2 HM Digital Sensor Probe

    SP-2 HM Digital Sensor Probe

    $14.29
    MSRP: $19.99
    Save 29%
  • SP-1-PSC HM Digital Sensor Probe

    SP-1-PSC HM Digital Sensor Probe

    $59.00
    MSRP: $59.97
    Save 2%
  • SP-1 HM Digital Sensor Probe

    SP-1 HM Digital Sensor Probe

    $59.69
    MSRP: $76.99
    Save 22%
  • SM-1 HM Digital Inline TDS Monitor
  • QC-1 HM Digital Filter System Monitor
  • SP-4 HM Digital Sensor Probe

    SP-4 HM Digital Sensor Probe

    $12.00
    MSRP: $13.79
    Save 13%
  • SP-5 HM Digital Sensor Probe

    SP-5 HM Digital Sensor Probe

    $11.00
    MSRP: $13.05
    Save 16%
  • TM-1 HM Digital Digital Thermometer

    TM-1 HM Digital Digital Thermometer

    $35.49
    MSRP: $45.99
    Save 23%
  • TDS-EZ HM Digital Water Test Meter

    TDS-EZ HM Digital Water Test Meter

    $19.95
    MSRP: $20.23
    Save 1%
  • TDS-4TM HM Digital Water Test Meter

    TDS-4TM HM Digital Water Test Meter

    $25.79
    MSRP: $33.99
    Save 24%
  • TDS-4 HM Digital Water Test Meter

    TDS-4 HM Digital Water Test Meter

    $23.79
    MSRP: $30.99
    Save 23%
  • TDS-3 HM Digital Water Test Meter

    TDS-3 HM Digital Water Test Meter

    $24.95
    MSRP: $27.83
    Save 10%
  • SP-P2 HM Digital Sensor

    SP-P2 HM Digital Sensor

    $44.95
    MSRP: $54.04
    Save 17%
  • SP-O2 HM Digital Sensor

    SP-O2 HM Digital Sensor

    $55.59
    MSRP: $70.99
    Save 22%
  • SP-C1 HM Digital Sensor

    SP-C1 HM Digital Sensor

    $34.95
    MSRP: $36.79
    Save 5%
  • DM-1 HM Digital Inline Dual TDS Monitor

    DM-1 HM Digital Inline Dual TDS Monitor

    $44.49
    MSRP: $55.99
    Save 21%
  • COM-100 HM Digital Water Test Meter
  • CC-1 HM Digital Protective Cover - Clear

    CC-1 HM Digital Protective Cover - Clear

    $29.95
    MSRP: $30.99
    Save 3%
  • C-342 HM Digital Calibration Solution

    C-342 HM Digital Calibration Solution

    $4.95
    MSRP: $10.34
    Save 52%
  • C-1000 HM Digital Calibration Solution

    C-1000 HM Digital Calibration Solution

    $4.95
    MSRP: $10.34
    Save 52%
  • AP-2 HM Digital Water Test Meter
  • AP-1 HM Digital Water Test Meter

    AP-1 HM Digital Water Test Meter

    $29.95
    MSRP: $31.96
    Save 6%
  • DM-2 HM Digital Commercial Inline Dual TDS Monitor
  • EC-3 HM Digital Water Test Meter
  • PH-BUF HM Digital Buffer Solution (12-Pack)

    PH-BUF HM Digital Buffer Solution (12-Pack)

    $10.99
    MSRP: $15.99
    Save 31%
  • PH-80 HM Digital Water Test Meter
  • ORP-BUF HM Digital Buffer Solution and Electrode Test Kit

    ORP-BUF HM Digital Buffer Solution and Electrode Test Kit

    $20.69
    MSRP: $27.99
    Save 26%
  • OP-STOR HM Digital Electrode Storage Solution
  • FM-2 HM Digital Filter Change Monitor

    FM-2 HM Digital Filter Change Monitor

    $39.95
    MSRP: $48.24
    Save 17%
  • ZT-2 HM Digital Water Test Meter

    ZT-2 HM Digital Water Test Meter

    $17.99
    MSRP: $26.45
    Save 32%

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