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  • Grow Kings - HM Digital Replacement pH Sensor
    $54.95

    HM Digital Replacement pH Sensor

    HydroMaster Digital tester makes monitoring water easier than ever by reading the levels that matter most and providing accurate readings that you ...

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    $54.95
  • Grow Kings - HM Digital™ Aquapro TDS Water Tester Model AP-1
    $42.95

    HM Digital™ Aquapro TDS Water Tester Model AP-1

    Measures total dissolved solids (TDS) and temperature. Automatic temperature compensation (ATC). Water-resistant housing with digital calibration (...

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    $42.95
  • Grow Kings - HM Digital™ Brix Refractometer Model SCM-1000
    $335.00

    HM Digital™ Brix Refractometer Model SCM-1000

    The SCM-1000 is a portable digital Brix refractometer that measures the sugar content of a fluid. The sugar content is defined as a percentage of t...

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    $335.00
  • Grow kings - HM Digital™ EC/TDS HydroTester Model COM-80
    $42.95

    HM Digital™ EC/TDS HydroTester Model COM-80

    The COM-80 is an economically priced, reliable EC/TDS meter that is ideal for testing applications such as hydroponics, gardening, pools, spas, aqu...

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    $42.95
  • Grow Kings - HM Digital™ HydroMaster Continuous pH/EC/TDS/Temp Monitor Model HM-500
    $359.00

    HM Digital™ HydroMaster Continuous pH/EC/TDS/Temp Monitor Model HM-500

    HydroMaster Digital tester makes monitoring water easier than ever by reading the levels that matter most and providing accurate readings that you ...

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    $359.00
  • Grow Kings - HM Digital™ Hydromaster Portable Model HM-200
    $274.95

    HM Digital™ Hydromaster Portable Model HM-200

    The HM-200 is a portable handheld meter that monitors pH, electrical conductivity (EC), total dissolved solids (TDS) and temperature. Features incl...

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    $274.95
  • Grow Kings - HM Digital™ pH Electrode Storage Solution
    $7.95

    HM Digital™ pH Electrode Storage Solution

    For use with HM Digital's PH-200 and PH-80 (as well as other brands of pH meters). Always make sure your sensor is kept in an electrode storage sol...

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    $7.95
  • Grow Kings - HM Digital™ pH Meter Model PH-80
    $46.50

    HM Digital™ pH Meter Model PH-80

    Resolution: pH 0.1 pH, 0.00–14.0 pH. Accurate to +/-0.1 pH. Hold button and auto shut-off. Automatic calibration: Auto-ranging to 4, 7 or 10 pH. Ve...

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    $46.50
  • Grow Kings - HM Digital™ pH/TDS/EC/Temp Meter Model COM-300
    $159.95

    HM Digital™ pH/TDS/EC/Temp Meter Model COM-300

    The COM-300 is an advanced waterproof combo meter with superior accuracy. The meter measures four parameters: pH, electrical conductivity (EC), tot...

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    $159.95
  • Grow Kings - HM Digital™ TDS Calibration Solution
    $6.69

    HM Digital™ TDS Calibration Solution

    For optimal performance, recalibrate your meters periodically or if testing TDS or conductivity levels in wide or different ranges. NaCl calibratio...

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    $6.69
  • Grow Kings - HM Digital™ Waterproof EC/TDS/TEMP Combo Meter Model COM-100
    $76.95

    HM Digital™ Waterproof EC/TDS/TEMP Combo Meter Model COM-100

    Measures electrical conductivity (EC), total dissolved solids (TDS) and temperature. Three different calibration options (KCl, 442TM, NaCl), each w...

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    $76.95
  • Grow Kings - HM Digital™ Waterproof pH Meter Model PH-200
    $99.95

    HM Digital™ Waterproof pH Meter Model PH-200

    Measures pH and temperature. Auto-ranging three point calibration with digital fine tuning. pH buffer 4 solution is in a sponge embedded in a clear...

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    $99.95