pH Testers & Supplies
Checking the pH in your hydroponic solution is a key element of successful gardening! Most plants do well in a slightly acidic solution, so try to maintain an average pH of 6.0. If your pH is too high (alkaline), add pH DOWN to lower the pH. If pH is too low (acidic), add pH UP to adjust the water. Check pH—and adjust if necessary—every 1-2 days! (All products on this page are for checking and adjusting pH of water or nutrient solutions. Click here for Soil pH Testers).
pH Meters & Testers
pH Control Kit
Contains 8 oz Ph Up (add a little at a time when your nutrient pH is too low in order to raise the pH to the proper level), 8 oz Ph Down (uses food grade Phosphoric acid to lower the pH to the proper level), and Ph Test Indicator (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).
pH Test Kit
Tests the pH of water or nutrient solution--add 3 drops of test fluid to water sample, then compare to a color chart. Each kit yields about 100 tests.
Litmus paper test just like you used in science class! Tear off a 2" strip then dip into nutrient solution. A vivid color change indicates pH.
Oakton Waterproof Digital pH Pen
Battery-powered test pen displays digital reading of a liquid's pH, expressed in 0.1 increments from 0 to 14. Waterproof. Includes protective case and replaceable electrode. 2-year warranty (1-year on probe).
Bluelab pH Pen
The highest quality pen on the market.
Liquid pH Down
AHL pH down is a 9% Phosphoric Acid solution which lowers the pH of water or nutrient solution. Usage amount depends on level of adjustment...usually 1/8 to 1/4 teaspoon per gallon. (Caution: Keep out of reach of children!)
Dry pH Down
Citric acid is a dry powder used to lower pH of water or nutrient solution. Citric acid will not be as pH stable as phosphoric acid, but citric acid is recommended for use in soil gardens or organic hydroponics. Use just a pinch per gallon.
Earth Juice Natural down is a dry granular citric acid.
Liquid ph Up
A 9% Potassium Hydroxide solution. Raises pH of water of nutrient solution. Amount used depends on level of adjustment...usually 1/8 to 1/4 teaspoon per gallon. (Caution: Keep out of reach of children!)
Dry pH up
Meter Calibration Solutions & Batteries
pH Calibration Solution
Use to calibrate your digital pH meter. Most meters can calibrate at both points, or for a single calibration choose the setpoint closest to your average solution pH.
Electrode Cleaning Solution
Dip electrode in Part A for 5 minutes, then Part B for 5 minutes, then rinse again in Part A. Increases accuracy and prolongs electrode life! Sold as a set of Part A & Part B.
Batteries for Digital Pens
Replacement batteries for pH, TDS or EC pens. Pack of 4.
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