The Mosser Lee Soil Master Soil Testing Kit is an easy and accurate way to measure soil pH, Nitrogen, Phosphorus and Potassium. The kit contains 10 tests for each element. Soil testing is recommended by professional gardeners as the only way to assure that your soil has the correct nutrients for your specific plants. Plants respond best when they receive the right plant food. Certain soil conditions can hinder plant growth and yield. Make sure that you feed your plants with what they need. Indoor plants and trees are particularly susceptible to soil deficiencies because we tend to just water them. Not all garden vegetable thrive on the same fertilizer. The only way to nourish your plants properly is to test before you plant and after you fertilize. Your plants need your help to eat right.