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Drops are reliable and simple to use. Fill the test tube about halfway with the nutrient solution, then add a few drops of the pH test indicator and observe the resulting color. Red (acidic) indicates that the pH is too low, blue (alkaline) indicates that the pH is too high, a yellow to a yellow-green indicates an ideal pH.
Height
Length
Width
Weight 0.10 lb
Length
Width
Weight 0.10 lb
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