Bluelab Guardian Monitor
In just one glance gardeners will know all 3 critical parameters for successful growth: pH, conductivity AND temperature. Large easy to read, dimmable 'Plant Safe' green LED displays. Selectable values for conductivity and temperature. Simple push button pH calibration. No calibration required for conductivity and temperature. Silent alarm for both high and low settings (retained when power is interupted). Temperature compensation. Durable water resistant design. 2 year warranty (6 month for pH probe)