Quickly Test for pH and N-P-K with this Electronic Soil Test Meter. Flip the switch of this meter to pH or Fertilizer Analysis, and thrust the meter into the soil, indoors or out, for quick reading. Measures pH on a zero to 9 range, and the relative levels of Nitrogen, Phosphorus and Potash (ppm) in the soil. The 24 page instruction book discusses methods for home gardeners to raise and lower pH and fertility levels. Use this meter with confidence! Requires 1 x AA battery. 1 year warranty.