Quick and accurate measuring of this key parameter. Proper soil pH is critical to optimum nutrient absorption by your crops. This meter gives +/- 0.1 pH accuracy while measuring the pH of soil samples, amendments, and irrigation water. Easy to use. Replaceable electrode. Also measures temperature with +/- 1°F (+/- 0.5°C) accuracy. For storage and calibration, 7.01 Buffer Solution is required. For greatest accuracy, also get the 4.01 pH Buffer Solution.