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  • GS1 pH pen product highlights
    GS1 pH pen
    $139.00 - $139.00
    $139.00
    $139.00 - $139.00
    $139.00

    GroStar GS1 pH Pen

    A lab-grade tool designed specifically for horticulture, this easy-to-use pen allows you to quickly measure and calibrate pH. Premium probe technol...

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    $139.00 - $139.00
    $139.00
    $139.00 - $139.00
    $139.00
  • GS3 ec pen product highlights and description
    GS3 ec pen
    $139.00 - $139.00
    $139.00
    $139.00 - $139.00
    $139.00

    GroStar GS3 EC Pen

    A lab-grade tool designed specifically for horticulture, this easy-to-use pen allows you to quickly measure and calibrate water EC, PPM (500), PPM ...

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    $139.00 - $139.00
    $139.00
    $139.00 - $139.00
    $139.00

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