pH controller- range: 0.0 to 14.0- with ±0.2 pH accuracy and 2 point manual calibration. Set point range 5.5 to 9.5 pH- and LED visual alarm active when reading is higher than set point. Power plug socket for CO2 dosing. Supplied with 12 volt DC power adapter- MA911B/2 double junction pH electrode- 20 ml. pH 7.01 sachet buffer solution and screwdriver for calibration. See also MA957 regulator.