GH pH Test Kit
Maintaining the proper pH of your fertilizer solution is critical to a crop's ability to utilize nutrients. The roll of pH Papers and General Hydroponics' pH Test Kit are inexpensive and reliable ways to test pH. For the pH paper, simply take a piece and dip it into your nutrient solution, and match the colors. To use the General Hydroponics pH Test Kit, fill the included vial with solution, add 3-4 drops of test solution, shake, and then match with the color chart provided.