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pH / TDS Testing

We have everything you need to check and balance the pH and PPM of your nutrients solutions including pH / TDS / EC meters, pH test kits, pH adjustment buffers and calibration solutions.  pH and TDS meters are invaluable tools for the indoor hydroponic gardener. Plants will not thrive in harsh conditions, and these instruments make it simple to ensure you are giving them the best balanced hydroponics nutrient solutions possible.

  • pH Control Kit w/ Up & Down

    General Hydroponics pH Control Kit makes pH testing easy. This package includes a GH pH Test Kit, a GH 8oz bottle of Liquid pH Up and a GH 8oz bottle of Liquid pH Down. Simply fill the included test-tube halfway with nutrient, add a few drops of pH Test...

    Our Price: $17.95
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  • GH pH Down 32oz

    The Acid formulation uses food grade Phosphoric acid to lower the pH to the proper level. Add a little at a time when your nutrient pH is too high in order to lower the pH to the proper level. Safe for use with all types of plants.

    Our Price: $13.95
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  • GH pH 7.0 Calibration Solution 8oz

    This is a brand new 8 ounce bottle of pH 7.0 Calibration Solution. General Hydroponics uses the highest quality reference solutions, allowing growers to calibrate many popular brands of PH meters. General Hydroponics technicians check each batch to...

    Our Price: $7.95
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  • pH Test Kit for Liquid

    General Hydroponics pH Test Kits make pH testing easy. Simply fill a test-tube halfway with nutrient, add a few drops of pH Test Indicator, and observe the coloration of the liquid in the test vial. Use 3 drops per 5mL of solution. This kit has a pH test...

    Our Price: $7.95
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  • GH pH Up 32oz

    This Base solution is formulated using Potassium Hydroxide and Potassium Carbonate. Add a little at a time when your nutrient pH is too low in order to raise the pH to the proper level. Safe for use with all types of plants.

    Our Price: $13.95
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  • Milwaukee PH600 pH Meter

    Milwaukee's most affordable pH meter.  The pH 600 is a full range pH meter with a range from 0.0 - 14.0 ph. Milwaukee's economical testers are easy-to-use and low cost instruments to measure quick and reliable pH values.  This meter should be...

    Our Price: $34.95
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  • GH pH Down Gallon 128oz

    The Acid formulation uses food grade Phosphoric acid to lower the pH to the proper level. Add a little at a time when your nutrient pH is too high in order to lower the pH to the proper level. Safe for use with all types of plants.

    Our Price: $32.95
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  • GH pH Down 8oz

    The Acid formulation uses food grade Phosphoric acid to lower the pH to the proper level. Add a little at a time when your nutrient pH is too high in order to lower the pH to the proper level. Safe for use with all types of plants.

    Our Price: $7.95
    Add to Cart
  • GH pH 4.01 Calibration Solution 8oz

    This is a brand new 8 ounce bottle of pH 4.01 Calibration Solution. General Hydroponics uses the highest quality reference solutions, allowing growers to calibrate many popular brands of PH meters. General Hydroponics technicians check each batch to...

    Our Price: $7.95
    Add to Cart
  • GH pH Up 8oz

    This Base solution is formulated using Potassium Hydroxide and Potassium Carbonate. Add a little at a time when your nutrient pH is too low in order to raise the pH to the proper level. Safe for use with all types of plants.

    Our Price: $7.95
    Add to Cart
  • GH pH Up Gallon 128oz

    This Base solution is formulated using Potassium Hydroxide and Potassium Carbonate. Add a little at a time when your nutrient pH is too low in order to raise the pH to the proper level. Safe for use with all types of plants.

    Our Price: $32.95
    Add to Cart
  • Bluelab pH Probe KCl Storage Solution

    The perfect solution to store and hydrate your Bluelab pH products. Bluelab knows it is extremely important to care for and store pH probes correctly. pH probes are sensitive glass instruments which age through normal use. The life and performance of pH...

    Our Price: $11.95
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  • Bluelab pH pen

    The Bluelab pH Pen is a handy option for hobby and small scale hydroponic growers. Maintaining proper pH levels is key in raising healthy, fruitful plants, and this pen accurately measures both the pH and temperature in your hydroponic system. It also...

    MSRP: $113.00
    Our Price: $99.95
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  • Hanna Primo Digital TDS Meter

    Hanna Instruments Primo TDS Meter Customers who want to ensure the purity of the water produced by their RO water filtration system will enjoy the ease-of-use afforded them by the Primo TDS Tester. This microprocessor-powered instrument provides Total...

    Our Price: $39.95
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  • pH Test Kit for Soil

    Rapitest pH Test Kits make pH testing of soil easy. Simply fill a test indicator with a little soil and water, add one green pH test capsule and shake. Then observe the coloration of the liquid in the test indicator versus the included color chart. This...

    Our Price: $6.95
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  • HM Digital pH Storage Solution 20 mL

    HM Digital pH Storage Solution is a vital component of pH meter care and maintenance. This potassium chloride solution (with fungicide) not only helps keep the probe clean, but it keeps the probe saturated for best performance.

    Our Price: $1.00
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  • Earth Juice Natural pH Down - 1.6 lb

    Proper pH levels are crucial for healthy plant growth. A pH that is too high or too low can reduce the availability of some nutrients. Effective in soil and hydroponics systems, Earth Juice uses citric acid to naturally lower pH. Earth Juice Natural pH...

    Our Price: $19.95
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  • HM Digital TDS meter TDS-3

    Ideal for commercial use, the TDS-3 includes a carrying case with belt clip. It is highly efficent and accurate due to its advanced microprocessor technology. It features a measurment range of 0-9990 ppm. From 0-999 ppm, the resolution is in increments...

    Our Price: $29.95
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