Knowing the EC/ppm, pH and temperature that the Nutrient Delivery System is providing to the crop will give the grower the confidence that the plants will receive the proper nutrition that they require. By installing the in-line Guardian Monitor with mixing chamber kit, the grower can be assured of a well-blended solution with an easy-to-read display. Kit includes a nippled, mixing chamber, union, tees, cross, ball valve, pressure gauge, hose adapter, reducer bushings, roll of pink Teflon tape and monitor. This is for a 1-1/2 inch system. Assembly required. This part is special order only.