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Automate CO2 dosing to ensure your plants get the right amount for respiration. Just plug a 115V solenoid valve (not included) into the socket supplied for dosing and your CO2 supply to the solenoid. The included pH electrode measures 0 to 14 pH (± .2 pH accuracy) and has manual 2-point calibration. Controller has a set point range of 5.5 to 9.5 pH and a visual LED alarm that activates when the reading goes above the set point. Uses a 115V/60 Hz to 12VDC adapter (included) and measures 31/4" x 51/2" x 11/2". Two-year warranty on the base unit, six months on the probe. Ship weight is 2 lbs.