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    HM Digital DM-1 In-Line Dual TDS Monitor 0-9990 ppm Range +/- 2% Readout Accuracy

    HM Digital DM-1 In-Line Dual TDS Monitor 0-9990 ppm Range +/- 2% Readout Accuracy

    The DM-1 is consumer friendly monitor measuring feed (input) water vs. product (output) water of a water filtration system at any time. This device is ideal for Reverse Osmosis (RO) Deionized water (DI) filtration systems that work well in variety of... more

    $32.29 $23.99

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    HM Digital AP-2 AquaPro Water Quality Tester

    HM Digital AP-2 AquaPro Water Quality Tester

    TDS Handheld meter with carrying case and built-in digital thermometer. An EC meter aka EC pen or conductivity tester is an inexpensive and convenient digital tool to instantly check your overall water quality. EC = Electrical Conductivity which the... more

    $28.99

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    HM Digital 1000 PPM CP-1000 20ml (1-pack)

    HM Digital 1000 PPM CP-1000 20ml (1-pack)

    Application: Aquaculture Aquarium Drinking Water Food & Beverage Hydroponics Industrial Pool/Spa Water Treatment more

    $7.99

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    HM Digital DM-3: Commercial In-Line Dual TDS Monitor

    HM Digital DM-3: Commercial In-Line Dual TDS Monitor

    The DM-3 is a commercial-grade TDS monitor measuring TDS feed (input) water vs. product (output) water of a water filtration system at any time. DM-3 has a large backlit screen that you will be able to see the readings in dark environments. With its... more

    $69.99

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    HM Digital Replacement pH/Temp sensor for PH-200/COM-360 (New model)

    HM Digital Replacement pH/Temp sensor for PH-200/COM-360 (New model)

    SP-P2 PH-200 Replacement Probe (Replacement pH/Temp Sensor for PH-200) Measures pH and Temperature Application: Aquaculture Aquarium Drinking Water Food & Beverage Hydroponics Industrial Pool/Spa Water Treatment more

    $49.99

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    HM Digital (PM-2) External In-Line TDS Purity Monitor 1-4 Quick Connect

    HM Digital (PM-2) External In-Line TDS Purity Monitor 1-4 Quick Connect

    This is a single inline TDS/purity meter which monitors any water purification system. It has an audible alert when the system requires service or maintenance. Features: Single line internal TDS monitor - great for most water purification systems which... more

    $89.96 $72.99

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    HM Digital HM-500 TDS/EC Replacement Probe

    HM Digital HM-500 TDS/EC Replacement Probe

    SP-C5 HM-500 TDS/EC Replacement Probe (Replacement EC/TDS sensor for HM-500) Measures Conductivity and TDS Measures Temperature Application: Aquaculture Aquarium Drinking Water Food & Beverage Hydroponics Pool/Spa Water Treatment more

    $52.99

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    HM DM-1 In-Line Dual TDS Monitor

    HM DM-1 In-Line Dual TDS Monitor

    The HM DM-1 In-Line Dual TDS Monitor allows you to measure the tap water going into your filteration system versus the filtered water coming out of your system at any time. Stop guessing the performance of your filtration system with the DM1! more

    $24

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