General Hydroponics PH Test Indicator, 8-Ounce
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<b>[Product Information]</b><br>
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<li>Fill a test-tube halfway with nutrient</li>
<li>Add a few drops of pH Test Indicator</li>
<li>Observe the coloration of the liquid in the test vial. Use 3 drops per 5mL of solution</li>
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