The Bluelab Guardian Monitor Connect is a constant read meter of the desired levels of pH, conductivity and temperature of your nutrient solution. The meter data logs pH and PPM to your computer. It does not stop there. You can access the data via the cloud from a remote mobile device or computer to check for extreme variances to ensure these critical parameters are hitting the mark for crop success. Just one Bluelab Connect Stick is required to receive wireless data from one or more Guardian Monitor Connects.