Monitor and control the pH levels of your solution automatically with pH Controllers from Bluelab. Controllers provide selectable, single-direction correction (either up or down), with the ability to control across the full pH range with an accuracy of +/- 0.1 point. Dosing up to 10 ml per minute to support reservoirs up to 200 gallons. Easy calibration protocols and visual alarm states. pH Controller Connect includes wireless data logging capabilities. Use with Bluelab pH Down (35% phosphoric acid) or pH Up (35% potassium hydroxide) solutions.