The mV Computer Set uses the same microprocessor technique as the pH Computer-Set. Waterproof touch keys are used to set the required values and calibrate the electrode. The mV Computer Set is ideal for controlling anaerobic biological filters such as the Nitratereductor which have negative redox potential, control the supply of ozone to the aquarium, or monitor the aquarium waterís redox potential. All these functions are possible due to the computerís broad measurement and control range of Ė500 to +1000 mV. The direction of control can be set upwards or downwards. The status of the direction of control and the output are shown on LEDís. A low pressure mV electrode with a BNC connector and calibration fluid is included.