Product specifically designed to be used only in soil
Instantly reads nutrient content of soil
Computes total nitrogen, phosphorus, and potash
No batteries required
Take the guess work out of fertilizing your plants. In a 10-second test, the soil fertility meter reads the combined levels of nitrogen, phosphorous and potash for maximum health, growth and productivity. Measurements are based on U.S. Dept. of Agriculture.
Luster Leaf 1865 Rapitest Soil Fertility Meter - B006JFY9ZW