pH, EC, & TDS Meters

Wwe provide an extensive selection of pH, EC, and TDS meters tailored for all gardening applications—from indoor and hydroponic setups to greenhouse and outdoor cultivation. With our range of monitoring solutions, you can effortlessly maintain optimal parameters for your plants, driving healthy growth and maximizing yields.

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General Hydroponics PRO pH Down 55 gal

General Hydroponics PRO pH Down 55 gal

Q102212

General Hydroponics® Pro pH adjusters are based on completely different technology than our traditional smaller sized adjusters offering. New non-mineral based acids and bases will not add nutrient value like the use of phosphoric acid or potassium hydroxide. They are safer to use as well as compared to mineral based adjusters. This is due to having a zero rating score for all safety categories on the HMIS scale as well as being non-corrosive and non-caustic. This means there are no HazMat fees to ship these products like other pH adjusters. Use Pro pH UP or Pro pH DOWN to effectively adjust the pH of nutrient solutions or irrigation water. GH Pro pH adjusters are highly concentrated and available in commercial sizes.

  • Non-Caustic
  • Non-Corrosive
  • Do not need to be shipped Hazmat like other adjusters
  • Alternative to harsh mineral hydroxides
  • Triple zero HMIS score
  • Does not contribute nutritional value like other adjusters
  • Concentrated Formula
General Hydroponics PRO pH Up 55 gal

General Hydroponics PRO pH Up 55 gal

Q113143
General Hydroponics Pro pH adjusters are based on completely different technology than our traditional smaller sized adjusters offering. New non-mineral based acids and bases will not add nutrient value like the use of phosphoric acid or potassium hydroxide. They are safer to use as well as compared to mineral based adjusters. This is due to having a zero rating score for all safety categories on the HMIS scale as well as being non-corrosive and non-caustic. This means there are no HazMat fees to ship these products like other pH adjusters. Use Pro pH UP or Pro pH DOWN to effectively adjust the pH of nutrient solutions or irrigation water. GH Pro pH adjusters are highly concentrated and available in commercial sizes.
General Hydroponics PRO pH Down 2.5 gal (2/CS)

General Hydroponics PRO pH Down 2.5 gal (2/CS)

Q113147
General Hydroponics Pro pH adjusters are based on completely different technology than our traditional smaller sized adjusters offering. New non-mineral based acids and bases will not add nutrient value like the use of phosphoric acid or potassium hydroxide. They are safer to use as well as compared to mineral based adjusters. This is due to having a zero rating score for all safety categories on the HMIS scale as well as being non-corrosive and non-caustic. This means there are no HazMat fees to ship these products like other pH adjusters. Use Pro pH UP or Pro pH DOWN to effectively adjust the pH of nutrient solutions or irrigation water. GH Pro pH adjusters are highly concentrated and available in commercial sizes.
GH pH Up Liquid Gallon (4/Cs)

GH pH Up Liquid Gallon (4/Cs)

Q113151
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.
General Hydroponics PRO pH Up 6 gal

General Hydroponics PRO pH Up 6 gal

Q113142
General Hydroponics Pro pH adjusters are based on completely different technology than our traditional smaller sized adjusters offering. New non-mineral based acids and bases will not add nutrient value like the use of phosphoric acid or potassium hydroxide. They are safer to use as well as compared to mineral based adjusters. This is due to having a zero rating score for all safety categories on the HMIS scale as well as being non-corrosive and non-caustic. This means there are no HazMat fees to ship these products like other pH adjusters. Use Pro pH UP or Pro pH DOWN to effectively adjust the pH of nutrient solutions or irrigation water. GH Pro pH adjusters are highly concentrated and available in commercial sizes.
General Hydroponics PRO pH Down 6 gal

General Hydroponics PRO pH Down 6 gal

Q113144
General Hydroponics Pro pH adjusters are based on completely different technology than our traditional smaller sized adjusters offering. New non-mineral based acids and bases will not add nutrient value like the use of phosphoric acid or potassium hydroxide. They are safer to use as well as compared to mineral based adjusters. This is due to having a zero rating score for all safety categories on the HMIS scale as well as being non-corrosive and non-caustic. This means there are no HazMat fees to ship these products like other pH adjusters. Use Pro pH UP or Pro pH DOWN to effectively adjust the pH of nutrient solutions or irrigation water. GH Pro pH adjusters are highly concentrated and available in commercial sizes.
General Hydroponics PRO pH Up 2.5 gal (2/CS)

General Hydroponics PRO pH Up 2.5 gal (2/CS)

Q113146
General Hydroponics Pro pH adjusters are based on completely different technology than our traditional smaller sized adjusters offering. New non-mineral based acids and bases will not add nutrient value like the use of phosphoric acid or potassium hydroxide. They are safer to use as well as compared to mineral based adjusters. This is due to having a zero rating score for all safety categories on the HMIS scale as well as being non-corrosive and non-caustic. This means there are no HazMat fees to ship these products like other pH adjusters. Use Pro pH UP or Pro pH DOWN to effectively adjust the pH of nutrient solutions or irrigation water. GH Pro pH adjusters are highly concentrated and available in commercial sizes.
GH pH Down 8 oz (12/Cs)

GH pH Down 8 oz (12/Cs)

Q113152
The acid formulation uses phosphoric acid to lower the pH to the proper level.
GH pH Down Liquid Gallon (4/Cs)

GH pH Down Liquid Gallon (4/Cs)

Q113154
The acid formulation uses phosphoric acid to lower the pH to the proper level.
General Hydroponics PRO pH Down 55 gal

General Hydroponics PRO pH Down 55 gal

Q113145
General Hydroponics Pro pH adjusters are based on completely different technology than our traditional smaller sized adjusters offering. New non-mineral based acids and bases will not add nutrient value like the use of phosphoric acid or potassium hydroxide. They are safer to use as well as compared to mineral based adjusters. This is due to having a zero rating score for all safety categories on the HMIS scale as well as being non-corrosive and non-caustic. This means there are no HazMat fees to ship these products like other pH adjusters. Use Pro pH UP or Pro pH DOWN to effectively adjust the pH of nutrient solutions or irrigation water. GH Pro pH adjusters are highly concentrated and available in commercial sizes.
GH pH Up 8 oz (12/Cs)

GH pH Up 8 oz (12/Cs)

Q113149
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.
GH pH Down Liquid Quart (12/Cs)

GH pH Down Liquid Quart (12/Cs)

Q113153
The acid formulation uses phosphoric acid to lower the pH to the proper level.
GH pH Down Pro 1 Gallon

GH pH Down Pro 1 Gallon

Q100376

General Hydroponics® Pro pH adjusters are based on completely different technology than our traditional smaller sized adjusters offering. New non-mineral based acids and bases will not add nutrient value like the use of phosphoric acid or potassium hydroxide. They are safer to use as well as compared to mineral based adjusters. This is due to having a zero rating score for all safety categories on the HMIS scale as well as being non-corrosive and non-caustic. This means there are no HazMat fees to ship these products like other pH adjusters. Use Pro pH UP or Pro pH DOWN to effectively adjust the pH of nutrient solutions or irrigation water. GH Pro pH adjusters are highly concentrated and available in commercial sizes.

  • Non-Caustic
  • Non-Corrosive
  • Do not need to be shipped Hazmat like other adjusters
  • Alternative to harsh mineral hydroxides
  • Triple zero HMIS score
  • Does not contribute nutritional value like other adjusters
  • Concentrated Formula
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