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    • Apera Instruments GroStar GS3 EC Pen

      Apera Instruments GroStar GS3 EC Pen

      GroStar Product DocumentsGroStar pH 4 Solution SDSGroStar pH 7 Solution SDSGroStar pH 10 Solution SDSGroStar ORP Storage Solution SDSLab grade instruments designed specifically for growers! The GS3 EC Pen includes: 2.77 EC calibration solution (50 ml...

      $113.99 $89.76
    • Hydrologic DM-2 Industrial Dual TDS Monitor

      Hydrologic DM-2 Industrial Dual TDS Monitor

      DM-2 Industrial Dual TDS MonitorMeasure the untreated water coming in vs. the purified water going out of your reverse osmosis system at any time. This is important in determining when the RO membranes need to be changed.Auto-Off function conserves...

      $82.95 $65.72
    • HM Digital Waterproof EC/TDS/Temp HydroTester

      HM Digital Waterproof EC/TDS/Temp HydroTester

      The COM-80 is an economically priced, reliable EC/TDS meter that is ideal for testing applications such as hydroponics & gardening, pools & spas, aquariums & reef tanks, water ionizers, drinking water and more.Features:Measures electrical conductivity...

      $67.95 $40.69
    • HM Digital Waterproof EC/TDS/Temp Combo Meter

      HM Digital Waterproof EC/TDS/Temp Combo Meter

      The COM-100 is a professional level EC/TDS meter at an unbeatable price. Ideal for all water quality testing, water purification applications, wastewater regulation, aquaculture, hydroponics, colloidal silver, labs & scientific testing, pools & spas,...

      $76.95 $63.00
    • HM Digital HydroMaster HM-500 HM Digital HydroMaster HM-500

      HM Digital HydroMaster HM-500

      HydroMaster Digital tester makes monitoring water easier than ever by reading the levels that matter most and providing accurate readings that you can depend on. Continuous pH/EC/TDS/Temp monitor with rechargeable battery. Portable, wall mount or...

      $359.00 $276.40

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