Details: The HI9814 is a slim, light, and waterproof meter that allows you to measure pH, TDS (ppm), and temperature of your hydroponic nutrient solution. Quick to setup, simple to use, this TDS (ppm) meter makes testing simple. One combined, pre-amplified pH, EC, and TDS (ppm) probe for hassle-free measurements. Quick CAL mode for a speedy, single-point calibration for pH and EC with one solution. Designed for hydroponic, aquaponic, and greenhouse growers.