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$AVE MORE on Athena PRO! Use promo (AthenaTGD) at checkout for BETTER pricing on Athena's Pro Line (Click Here)

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  • Bluelab® pH Probe KCI Storage Solution 18ml

    Bluelab® pH Probe KCI Storage Solution 18ml

    Bluelab® pH Probe KCI Storage Solution 18ml

    Regular price $0.99 USD
    Regular price Sale price $0.99 USD
    Unit price /  per 
  • Bluelab® pH Probe KCI Storage Solution 250ml

    Bluelab® pH Probe KCI Storage Solution 250ml

    Bluelab® pH Probe KCI Storage Solution 250ml

    Regular price $19.99 USD
    Regular price Sale price $19.99 USD
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  • Bluelab® Probe Care Kit pH & Conductivity

    Bluelab® Probe Care Kit pH & Conductivity

    Bluelab® Probe Care Kit pH & Conductivity

    Regular price $21.99 USD
    Regular price Sale price $21.99 USD
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  • Bluelab® Replacement pH Probe

    Bluelab® Replacement pH Probe

    Sold out

    Bluelab® Replacement pH Probe

    Regular price $76.99 USD
    Regular price Sale price $76.99 USD
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  • General Hydroponics® pH 4.01 Calibration Solution 8 oz

    General Hydroponics® pH 4.01 Calibration Solution 8 oz

    General Hydroponics® pH 4.01 Calibration Solution 8 oz

    Regular price $3.99 USD
    Regular price Sale price $3.99 USD
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  • General Hydroponics® pH Control Kit

    General Hydroponics® pH Control Kit

    General Hydroponics® pH Control Kit

    Regular price $19.99 USD
    Regular price Sale price $19.99 USD
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  • General Hydroponics® pH Down 8 oz

    General Hydroponics® pH Down 8 oz

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    General Hydroponics® pH Down 8 oz

    Regular price $9.99 USD
    Regular price Sale price $9.99 USD
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  • General Hydroponics® pH Test Indicator 8oz

    General Hydroponics® pH Test Indicator 8oz

    General Hydroponics® pH Test Indicator 8oz

    Regular price $9.99 USD
    Regular price Sale price $9.99 USD
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  • General Hydroponics® pH Test Kit

    General Hydroponics® pH Test Kit

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    General Hydroponics® pH Test Kit

    Regular price $4.99 USD
    Regular price Sale price $4.99 USD
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  • General Hydroponics® pH Up 8 oz

    General Hydroponics® pH Up 8 oz

    General Hydroponics® pH Up 8 oz

    Regular price $9.99 USD
    Regular price Sale price $9.99 USD
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  • Hanna Instruments, GroLine, Direct Soil and Soilless Media pH Electrode

    Hanna Instruments, GroLine, Direct Soil and Soilless Media pH Electrode

    Sale

    Hanna Instruments, GroLine, Direct Soil and Soilless Media pH Electrode

    Regular price $189.99 USD
    Regular price $236.99 USD Sale price $189.99 USD
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  • HM Digital HydroMaster Portable/Wall Mount/Bench Continuous pH/EC/TDS/Temp HM-200

    HM Digital HydroMaster Portable/Wall Mount/Bench Continuous pH/EC/TDS/Temp HM-200

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    HM Digital HydroMaster Portable/Wall Mount/Bench Continuous pH/EC/TDS/Temp HM-200

    Regular price $189.99 USD
    Regular price Sale price $189.99 USD
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  • HM Digital pH 4.0 buffer solution 20ml

    HM Digital pH 4.0 buffer solution 20ml

    HM Digital pH 4.0 buffer solution 20ml

    Regular price $1.99 USD
    Regular price Sale price $1.99 USD
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  • HM Digital pH 7.0 buffer solution 20ml

    HM Digital pH 7.0 buffer solution 20ml

    HM Digital pH 7.0 buffer solution 20ml

    Regular price $1.99 USD
    Regular price Sale price $1.99 USD
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  • HM Digital Replacement TDS/EC sensor (Sp-C2)

    HM Digital Replacement TDS/EC sensor (Sp-C2)

    HM Digital Replacement TDS/EC sensor (Sp-C2)

    Regular price $39.99 USD
    Regular price Sale price $39.99 USD
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  • HM Digital® COM-300

    HM Digital® COM-300

    HM Digital® COM-300

    Regular price $115.00 USD
    Regular price Sale price $115.00 USD
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