Helps gardeners grow greener lawns and more abundant flowers, fruits, and vegetables. Testing the levels of pH, nitrogen, phosphorus, and potash takes just 3 easy steps: 1) mix soil with water, pour off liquid after soil settles into the chambers of the color compactor, 2) dissolve tablet, and 3) compare the color for test reading chart that is included in the kit. Kit contains 40 tests; 10 each for pH (acidity/alkalinity), nitrogen, phosphorus, and potash. Complete instructions are included for adjusting soil conditions and fertilization.