The No-Wait Home Soil Test Kit contains 40 tests (10 each) for pH, Nitrogen, Phosphorus and Potassium. No more waiting for costly soil sample test results. You can do your own affordable soil test, and know exactly what fertilizer and soil amendments are needed to enhance your soil quality. Unique, easy to use one step reagent allows test to begin immediately. Complete with instructions and chart for ideal ranges for pH and NPK levels for over 100 plants.