The SWAT-1 module is the communication “hub” where you connect the Croptiva SpH-1 pH probe and the SEC-1 combination EC/Temp probe. The SWAT-1 then connects to the Croptiva SEN-1, Sentry and GUARD-1, Guardian controllers.  The SWAT-1 also features its own built-in digital display to make it easy to remotely check the sensor readings, and to allow easy probe calibration right from the SWAT-1 module. The SWAT-1 module is one of 3 parts that are needed to monitor pH, EC & water temperature. The other two parts required are the 2 water probes called the SpH-1 pH probe and the SEC-1 EC/Temp probe. The module and probes provide 24/7/365 monitoring for either a stock or fresh water tank, in-line (dosing system), or downstream monitoring of plant run-off.