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  •  

    Active Air 2-Way Moisture and pH Meter (4 Pack)

    $23.35
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  •  

    (2) Hanna Instruments Grochek pH/EC/TDS/C Portable Meters w/ Cal Check | HI9813-6N

    $435.95
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  •  

    (2) Hanna Instruments Grochek pHep 4 Waterproof PH Temperature Meters | HI98127

    $209.99
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  •  

    (2) Hanna Instruments PH ORP & Temperature Meters | HI98121

    $414.99
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  •  

    (2) Hanna Instruments pHep PH Meters | HI98107

    $99.99
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  •  

    (2) Hanna Instruments Replaceable Electrodes | HI98127, HI98128, HI98129, & HI98130

    $114.99
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  •  

    (2) Oakton EcoTestr pH1 Waterproof pH Meters | OK35423-00

    $124.99
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  •  

    Active Air 2-Way Moisture and pH Meter

    $9.99
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  •  

    Active Air 2-Way Moisture and pH Meter (2 Pack)

    $15.65
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  •  

    Autopilot Desktop CO2 Monitor and Data Logger

    $101.49
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  •  

    Autopilot Desktop CO2 Monitor and Data Logger (2 Pack)

    $202.99
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  •  

    Hanna Instruments Grochek pH/EC/TDS/C Portable Meter w/ Cal Check | HI9813-6N

    $244.49
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  •  

    Hanna Instruments Grochek pHep 4 Waterproof PH Temperature Meter | HI98127

    $120.39
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  •  

    Hanna Instruments pHep PH Meter | HI98107

    $54.99
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  •  

    Hanna Instruments Replaceable PH Electrode for HI98127, HI98128, HI98129, & HI98130

    $73.59
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  •  

    Hydrofarm Active Aqua 0.5 HP Chiller

    $641.09
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  •  

    Hydrofarm Active Aqua 0.5 HP Chiller (2 Pack)

    $1,282.99
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  •  

    Hydrofarm Portable Handheld Quantum PAR Meter

    $120.89
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  •  

    Hydrofarm Portable Handheld Quantum PAR Meter (2 Pack)

    $229.99
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  •  

    Hydrofarm Portable Handheld Quantum PAR Meter (6 Pack)

    $724.89
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  •  

    Oakton EcoTestr pH1 Waterproof pH Meter | OK35423-00

    $72.09
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  •  

    Oakton EcoTestr pH1 Waterproof pH Meter | OK35423-00 (3 Pack)

    $179.49
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