Bluelab Guardian MonitorIn just one glance it clearly conveys all 3 critical parameters for successful growth: pH, conductivity AND temperature. The Bluelab Guardian Monitor is a constant indicator of the desired levels of EC ppm 700 TDS CF, pH and temperature, enabling the grower to optimise these parameters as the crop progresses through each growing phase. The Bluelab Guardian Monitor is mains powered and is mounted to the wall or hung on a support and the probes simply