Bluelab Guardian MonitorBluelab Guardian monitor provides 24 h continuous tracking of pH, conductivity (EC ppm 700 TDS CF) and temperature within a nutrient solution. Optimizing these important parameters through the plant growing cycle to ensure a successful crop. Designed for indoor use and can be mounted on a wall or hung on a support bar. Just set up the reservoir, place the pH and conductivity probes in the solution, then adjust and observe. You can simply set the high