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  • GroStar EC Calibration Kit (2.77 EC, 8 oz. each)

    GroStar by Apera EC Calibration Kit (2.77 EC, 8 oz. each) • 2.77 EC conductivity standard calibration solution• Used as a reference or ...

    $10.37

  • GroStar GS1 pH Pen

    AI11010 - GroStar GS1 pH PenLab grade instruments designed specifically for growers!Includes: • 2-year warranty (instrument)• 1-year warranty (probe)• pH 7 ...

    $83.97

  • GroStar GS1-E replacement pH electrode

    AI58010 - GroStar GS1-E replacement pH electrode • Replacement GS1 probe measures pH and temperature• Premium probe technologies and materials ensure high accuracy ...

    $35.29

  • GroStar GS2 Soil pH Pen

    AI31020 - GroStar GS2 Soil pH PenLab grade instruments designed specifically for growers!Includes: • 2-year warranty (instrument)• 1-year warranty (probe)• pH ...

    $177.87

  • GroStar GS2-E replacement Soil Spear pH electrode

    AI58020 - GroStar GS2-E replacement Soil Spear pH electrode • Spear pH Probe measures pH and temperature in nutrient solution, soil, coco ...

    $125.96

  • GroStar GS3 EC Pen

    AI11030 - GroStar GS3 EC/PPM/Temp PenLab grade instruments designed specifically for growers!Includes: • 2-year warranty (instrument)• 1-year warranty (probe)• 2.77 EC ...

    $78.90

  • GroStar GS3-E replacement EC electrode

    AI58030 - GroStar GS3-E replacement EC electrode • Measures conductivity EC, PPM (500), PPM (700) and temperature• Premium probe technologies and materials ensure ...

    $37.37

  • GroStar GS4 pH/EC/500ppm/700ppm/Temp (5-in-1) Combo Pen

    AI21040 - GroStar GS4 pH/EC/500ppm/700ppm & Temp (5-in-1) Combo PenLab grade instruments designed specifically for growers!Includes: • 2-year warranty (instrument)• 1-year ...

    $123.89

  • GroStar GS4-E replacement pH/EC combo electrode

    AI58040 - GroStar GS4-E replacement pH/EC combo electrode • Measures pH, conductivity (EC and PPM) and temperature• Combo probe built with lithium glass ...

    $55.36

  • GroStar pH calibration kit (pH 4/7, 8 oz. each)

    GroStar by Apera pH calibration kit (pH 4/7, 8 oz. each) Kit includes:  (1) 8 oz. pH 4.0 calibration solution (1) 8 ...

    $13.14

  • GroStar pH calibration kit (pH 4/7/10, 8 oz. each)

    GroStar by Apera pH calibration kit (pH 4/7/10, 8 oz. each) Kit Includes: (1) pH 4.0 calibration solution 8 oz. (1) pH 7.0 ...

    $20.06

  • GroStar pH Probe Maintanence Kit

    All-in-one maintanence kit provides everything you need to maintain, clean and store your GroStar pH probe Kit Includes:  3M KCL storage solution (4oz.) Cleaning solution ...

    $16.60