Level control of a tank or well (maximum-minimum via electrodes) Adjusts the level in a tank and is controlled by three electrodes, one common placed deeper than all, one for the upper and one for the lower desired level. If the tank is metallic, a third electrode is not required. It works with all conductive liquids with adjustable sensitivity from 0 ~ 60 KΩ. When the electrodes are wet, turn the potentiometer from zero towards one and stop the adjustment at the point where the LED lights up. With the correct adjustment, unwanted operation due to moisture is avoided.