The Nutriculture pH Test Kit allows quick and accurate monitoring of pH levels in your nutrient solution. For accurate acidity testing follow the procedure below. Take a 2ml sample of solution from the tank in the test tube provided. Add 2 drops of reagent. Shake the test tube and compare the colour against the test strip to determine the acidity. Discard the test solution and rinse out the test tube. Adjust the pH of your nutrients and retest if neccessary.