Best Hydroponic pH Tester
1. Fill the vial with a tested medium to a level indicated on the Chart.
2. Add only one drop of the pH Tester solution. Note: adding more would give more saturated colors but they are hard to distinguish in a low pH range.
3. Compare color with the chart. Although it is not required, the best color difference you would see with a daylight fluorescent bulb (6500 °K).
If the pH is close to 5.0, use pH Up solution (usually diluted potassiun hydroxide), if it's above 7.0, use pH Down solution (usually diluted phosphoric acid). Both solutions are readily available in your local grow store. The kit can be used to check out pH of soil samples. In this case, the optimum pH is near 7.0.
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