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Pens

  • Out of Stock

    Bluelab pH Pen

    $126.14
    $126.14 - $126.14
    $126.14
    $82.20
    $82.20 - $82.20
    $82.20

    Measures pH and temperature. Selectable units for °C & °F. Backlit LCD display. Double junction probe (not replaceable). Successful calibration...

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    $126.14
    $126.14 - $126.14
    $126.14
    $82.20
    $82.20 - $82.20
    $82.20
    Out of Stock
  • Out of Stock

    Bluelab PPM Pen

    $104.94
    $104.94 - $104.94
    $104.94
    $68.39
    $68.39 - $68.39
    $68.39

    Measures conductivity and temperature. Selectable units for conductivity and temperature. Backlit LCD display with low battery warning. Successful ...

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    $104.94
    $104.94 - $104.94
    $104.94
    $68.39
    $68.39 - $68.39
    $68.39
    Out of Stock
  • Out of Stock

    Oakton Waterproof EcoTestr pH 1

    $77.02
    $77.02 - $77.02
    $77.02
    $45.95
    $45.95 - $45.95
    $45.95

    $77.02
    $77.02 - $77.02
    $77.02
    $45.95
    $45.95 - $45.95
    $45.95
    Out of Stock
  • Out of Stock

    Bluelab Soil pH Pen

    $210.94
    $210.94 - $210.94
    $210.94
    $119.06
    $119.06 - $119.06
    $119.06

    $210.94
    $210.94 - $210.94
    $210.94
    $119.06
    $119.06 - $119.06
    $119.06
    Out of Stock
  • Out of Stock

    Rapitest Mini pH Tester

    $6.30 - $6.30
    $6.30
    $6.30 - $6.30
    $6.30

    $6.30 - $6.30
    $6.30
    $6.30 - $6.30
    $6.30
    Out of Stock
  • Out of Stock

    Rapitest Soil Test pH N,P,K (6-Cs)

    $22.79 - $22.79
    $22.79
    $22.79 - $22.79
    $22.79

    Rapitest Soil Test Kit uses a patented color comparator test system. Performs forty (40) tests, ten (10) each for soil pH, Nitrogen, Phosphorus and...

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    $22.79 - $22.79
    $22.79
    $22.79 - $22.79
    $22.79
    Out of Stock
  • Out of Stock

    Rapitest pH Soil Tester (12-Cs)

    $4.49 - $4.49
    $4.49
    $8.79
    $8.79 - $8.79
    $8.79

    Rapitest Soil pH Test Kit uses a patented color comparator test system. Performs ten (10) tests for soil pH. Test results allow the gardener to ame...

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    $4.49 - $4.49
    $4.49
    $8.79
    $8.79 - $8.79
    $8.79
    Out of Stock
  • Out of Stock

    Luster Leaf Rapitest 4 Way Analyzer (3-Cs)

    $39.79 - $39.79
    $39.79
    $39.79 - $39.79
    $39.79

    Rapitest 4-Way Analyzer incorporates a three (3) probe design. The unit determines soil pH (acidity/alkalinity), fertility (combined N-P-K levels),...

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    $39.79 - $39.79
    $39.79
    $39.79 - $39.79
    $39.79
    Out of Stock
  • FALSE
    Out of Stock

    Sure Test Base pH Pen +-- 0.3

    $0.00 - $0.00
    $0.00
    $33.99
    $33.99 - $33.99
    $33.99

    $0.00 - $0.00
    $0.00
    $33.99
    $33.99 - $33.99
    $33.99
    Out of Stock
  • Out of Stock

    Oakton Waterproof EcoTestr pH 2

    $68.32 - $68.32
    $68.32
    $68.32 - $68.32
    $68.32

    $68.32 - $68.32
    $68.32
    $68.32 - $68.32
    $68.32
    Out of Stock
  • FALSE
    Out of Stock

    Sure Test Commercial pH - EC - TDS - ORP Lab Meter

    $0.00 - $0.00
    $0.00
    $356.99
    $356.99 - $356.99
    $356.99

    $0.00 - $0.00
    $0.00
    $356.99
    $356.99 - $356.99
    $356.99
    Out of Stock
  • FALSE
    Out of Stock

    Sure Test Pro EC - TDS Pen

    $0.00 - $0.00
    $0.00
    $24.99
    $24.99 - $24.99
    $24.99

    $0.00 - $0.00
    $0.00
    $24.99
    $24.99 - $24.99
    $24.99
    Out of Stock
  • FALSE
    Out of Stock

    Sure Test Pro pH Pen w- Replaceable Probe +-- 0.05 ATC

    $0.00 - $0.00
    $0.00
    $78.99
    $78.99 - $78.99
    $78.99

    $0.00 - $0.00
    $0.00
    $78.99
    $78.99 - $78.99
    $78.99
    Out of Stock
  • FALSE
    Out of Stock

    Sure Test Base Plus pH Pen +-- 0.05 ATC

    $0.00 - $0.00
    $0.00
    $28.99
    $28.99 - $28.99
    $28.99

    $0.00 - $0.00
    $0.00
    $28.99
    $28.99 - $28.99
    $28.99
    Out of Stock
  • Out of Stock

    Sure Test Commercial Multi-Meter w- pH Conductivity Probes (DO Probe Sold Separately)

    $106.99 - $106.99
    $106.99
    $106.99 - $106.99
    $106.99

    $106.99 - $106.99
    $106.99
    $106.99 - $106.99
    $106.99
    Out of Stock
  • FALSE
    Out of Stock

    HM Digital Brix Refractometer

    $0.00 - $0.00
    $0.00
    $231.09
    $231.09 - $231.09
    $231.09

    Special order item; may take up to two weeks before it ships.

    $0.00 - $0.00
    $0.00
    $231.09
    $231.09 - $231.09
    $231.09
    Out of Stock
  • Out of Stock

    Oakton Waterproof EcoTester pH 2+

    $0.00 - $0.00
    $0.00
    $68.02
    $68.02 - $68.02
    $68.02

    $0.00 - $0.00
    $0.00
    $68.02
    $68.02 - $68.02
    $68.02
    Out of Stock
  • Out of Stock

    Milwaukee pH Controller

    $161.99 - $161.99
    $161.99
    $161.99 - $161.99
    $161.99

    $161.99 - $161.99
    $161.99
    $161.99 - $161.99
    $161.99
    Out of Stock
  • Out of Stock

    Oakton Waterproof EcoTestr TDS Low

    $65.27 - $65.27
    $65.27
    $65.27 - $65.27
    $65.27

    $65.27 - $65.27
    $65.27
    $65.27 - $65.27
    $65.27
    Out of Stock

Pens and Green Houses Benefits

Pen like pH or TDS testers are easy to use and calibrate. They are sensitive to small changes and can be carried in pocket easily to any place. EC hydroponics is good way to ensure good growth in plants, you can also compare using EC vs PPM to check what works better for your hydroponic garden. Pick from our selection of high quality, water proof pens from brands such as HM Digital and Oakton. Zenhydro offers discount pens online, waterproof hydroponic pens, EC pen, advanced nutrients PPM scale, hydroponic EC and many more. Check out today.