This meter gives you the ability to monitor pH level, Nutrient Levels in PPM and Nutrient Temperature. This continuous monitoring system requires no batteries, just plug it in to an AC wall receptacle and the meter will remain in a calibrated mode for months. The Nutradip® Tri-Meter, with automatic temperature compensation, is the best way of measuring the strength of nutrients in your water, pH, and monitoring temperature at the same time. 2 year limited warranty on meter. 6 month limited warranty on the probe.