The sample pot is a very important part of any monitoring/dosing system. You simply mount this pot on the wall near the controller, and place the pH and/or EC probe into it. A pump in the reservoir will keep water flowing 24/7, so the probes are always getting the most accurate readings. Keeping the probes in the sample pot makes sure they cannot be broken or accidentally removed from the reservoir and they are easy to calibrate. In the Box: Sample Pot Mounting Bracket Grommets and Elbows All mounting hardware Starter calibration solutions (pH 4, pH 7, EC) Fittings are: 1/2” intake from pump; 3/4” overflow back to reservoir. When ordering, please specify which dosing system you are needing the sample pot for. Can be used with a pH Mini, IntelliDose, Aphaea and MultiGrow. Can also be used for DIY applications and with other brands of dosers.