SoilKit is like a DNA test for your soil! Collect a soil sample, mail it in, and get expert results you can actually use. SoilKit includes a packet for collecting and tracking your soil, a prepaid mailing envelope, and easy, clear instructions. Your soil will be tested in a leading national agricultural lab. Register your kit online (also included), and you'll receive fast results and recommendations for ways to improve your specific soil. Keep your entire lawn and garden healthy with better soil - starting with professional soil testing from SoilKit. Works for specific problem areas, too! Tests for pH, Phosphorus(P), Potassium (K), Magnesium (Mg), Calcium (Ca), Boron (B), Zinc (Zn), Manganese (Mn), Iron (Fe). SoilKit is valid for testing up to a 10,000 sq. ft. area.