GHE pH test kit is a liquid pH indicator. They are a low cost and reliable way of measuring the pH of your nutrient solution. Just half fill the vial with your finished nutrient solution, add three drops of the liquid indicator and shake. This will make your sample of nutrient solution change colour, and then compare the colour of your sample to the chart provided to determine the pH level.
Easy to use
Used by amateurs and professionals
Good for up to 150 tests