Luster Leaf Rapitest - Probador de Suelos, Kit de análisis Digital del Suelo para pH, N, P y K, Digital Soil Test Kit for pH, N, P and K, 1Reads test colors utilizing advanced LED digital technologyJust push test button to get results in a few secondsIncludes pH preferences for over 450 plants and how to adjust soil pHBooklet has fertilizer guidelines based on nitrogen, phosphorus and potash test results.Performs 25 tests: 10 for pH and 5 each for Nitrogen, Phosphorus and Potash