[Great Digital pH Tester] A great tool to monitor pH level regularly, as the pH of nutrient solution being such an important factor in hydroponic systems. For the majority of plants, a pH range of 5.3-6.5 is considered optimal for hydroponic gardening. UIUZMAR tester helps you know if your water is within the optimum range for maximum nutrient uptake. | [PPM EC Meter for Hydroponics] Check what the TDS and EC level is in a hydroponic system, and helps you balance water to keep plants happy and healthy. To grow the faster and healthier plants, it is vital to have the correct EC and PPM level. | [4 in 1 pH Meter] With pH TDS EC TEMP functions; General uses include hydroponics, greenhouse reservoir, DWC setup, indoor plant, hot tub, spa, drinking water, home tap water, well water, RO system, aquarium, and home brewing. | [Easy to Calibration and Storage] Simple 3-point pH calibration process (pH4.0/ 7.0/10.01), comes with 2 sets of pH calibration powders. EC/TDS is pre-calibrated, right out of the box. | [Product Design Features] Automatic temperature compensation (32-122 ℉), provides consistent reading regardless of any fluctuations in temperature. With LCD backlit, the backlight shuts off in 30 seconds, press any key to reopen backlight.