Luster Leaf 1662 Professional Soil Kit with 40 TestsComplete Professional Soil Testing Made Simple Know exactly what your soil needs with the Luster Leaf 1662 Professional Soil Kit. This comprehensive kit includes 40 tests to check your soil's pH, nitrogen, phosphorus, and potash levels. With a patented color comparator system and clear instructions, you'll get accurate results to help your plants thrive. KEY FEATURES 40 total tests (10 each for N,P,K, and pH) Patented color comparison system Plant