With the Aqua Medic LF Controller you can measure and control the conductivity of your aquarium water as a parameter of the salt content continuously. The salt content of water can be determined by measuring the electrical conductivity. A special feature of the Aqua Medic LF Controller conductivity monitor and controller is the broad measurement and control range which is divided into 2 bands: from 0 to 2000S, the unit is used for monitoring desalinated water and freshwater, and in the range 0 to 200 mS, it is used for brackish and saltwater. The unit can therefore be used for the control of reverse osmosis units, for monitoring breeding tanks with soft water and for the control of the salt content in marine aquaria. The unit is supplied with a directly connected, saltwater resistant graphite electrode.technical Data Aqua Medic LF ControllerDisplay: 0.5 LED, 3-1/2 digitsMeasuring range: 0 - 1,999S, 0 - 199,9 mSResolution: 1S ( 0 - 1,999S), 0,1 mS ( 0 - 199,9 mS)Accuracy: +/- 1