Questions about Kemo Level indicator

It does not need a sensor, only a cable. This is not included. The cable ends are placed in the water at different points. Through contact with the water, the cable ends are connected and the Sonsor knows how much water is in the tank. See picture 2+3. Actually quite simple, nothing high-tech, but works perfectly. Some understanding of electricity required: if you know what an electric circuit is, you're good to go. By the way, the LEDs can be controlled individually, so it is also possible to display several tanks, e.g. 2 tanks with 5 levels each, or 10 tanks with only one contact (empty/full).