pH Tester for Growers: Optimal pH range for most hydroponic plants is 5.3-6.5. If the pH is too low, plants may not be able to access important nutrients. If the pH is too high, plants may experience yellowing leaves and stunted TDS (PPM) EC Meter for Growers: Optimal TDS range for most plants is 700-2100 ppm. TDS and EC level confirms whether the nutrient levels are correct Accurate and Easy to Use: Providing accurate readings at the click of a button, ± 0.1 pH Accurate Pre-calibrated and Easy Calibration: Our meter is pre-calibrated and ready to use. 2 sets of standard solution included for pH calibration Design for Growers: Digital LCD display, automatic temperature compensation (32-122 ℉), provides consistent reading regardless of any fluctuations in temperature Awesome Plant 4-in-1 hydroponic tester uses newly upgraded electrodes to provides stable and accurate values. Easy to measure the pH, TDS, EC and TEMP of solution. If you need a testing tool when making hydroponic nutrient solution at home, Awesome Plant pH EC TDS (PPM) meter is your handy solution. With pH EC PPM Temp 4 in 1 function, pre-calibrated and easy operation, perfect for hydroponic garden, DWC setup, aeroponic growing system, aquaponics. For most plants, the pH range of 5.3-6.5 is considered the optimal value for hydroponic gardening. Awesome Plant pH tester helps you precisely adjust the pH level of your hydroponics so that your water is within the optimum range for the plants can absorb the maximum nutrients. The EC range of the tester is 0-9999μS/cm, 10.1-19.99mS/cm. Accurately check the EC level to know the nutrition level of your solution.