HortiCare pH Tester by Trans Instruments will help you acquire the right pH level of specific water solutions, and help you meet specific plants requirements. By achieving the right pH level, the nutrient solution or fertilizer mixture can better supply the plant roots with water, oxygen and essential mineral elements in soluble form. Wrong pH nutrient solution results in stunted of growth and even death of the plant. This pH check tester is specially designed with advanced features to ensure fast and accurate pH testing, for the commercial as well as home growers. It has convenient features such as; Hold Function - the ability to freeze display for ease of reading, and Beep Function - the ability to beep to signal the beginning and end of each function. You can also obtain +/- 0.2 pH accuracy through one-touch calibration and the auto-lock function provides intelligent sensing of end reading. Operating Range: 0 to 14.0 pH | Resolution: 0.1 pH Battery: 4 x 1.5V Button Cell (LR44).