The pH Computer is a microprocessor run pH monitor and controller that provides high precision measurement and control. The waterproof proof front panel includes soft touch keys to set the operating values and to calibrate the electrode. The switching bandwidth (hysteresis) is adjustable over a wide range to define the amount of pH drift allowed before switching. With the pH Computer you can set the control direction up or down, allowing you to use the computer in High Mode to activate a pump dosing Kalkwasser to maintain a high pH, or in Low Mode for dosing CO2 to maintain a low pH. The Aqua Medic pH Computer includes an electrode and a complete set of calibration fluids. Calibration is easier too, simply submerge the electrode in the calibration solution and push the corresponding CAL button. The pH Computer automatically calibrates itself to the solution.