The mV controller 2001 C is designed for monitoring and controlling the redox potential (or ORP - oxidation-reduction-potential) in aquaria. The unit has a broad controlling range from -500 to a +500mV, and a measuring range from -1000 to +1000mV. It can be used to control the supply of ozone in salt water aquaria and / or for the control of nitrate removal in anaerobic biological filters (Aqua Medic Nitratereductor). The unit is supplied with a BNC connection for an mV probe. The use of an original Aqua Medic plastic shafted electrode is recommended.