The Milwaukee MC122 controller continuously measures and monitors the pH lavue and keeps it constant. Simply set your pH parameters and let the Milwaukee pH controller do the rest. The control range of the Milwaukee MC122 is in a wide range from 5.5 to 9.5 pH. A solenoid valve for controlling a CO2 system or a dosing pump can be connected to the switching output. The Milwaukee NC 122 is easy to use with simple 2-point manual calibration. The pH electrode in laboratory quality is inlcuded.Milwaukee digital pH Controller MC122+ digital pH measuring and control unit+ measuring range: 0 - 14 pH+ reluglating range: 5.5 to 9.5 pH+ resolution: 0.1 pH+ accuracy: +/- 0.2 pH+ max. switching power. 5A+ power supply 12 V included+ pH electrode inlcuded (laboraty quality)+ + simple manual two-point calibration+ mounting set included+ dimensions. 148.5 x 82.5 x 32 mm+ calibrations solutions (pH 4.01 & pH 7.01)