NINA Liquid Level Controls is the optimum choice for any situation requiring the precise control of a water level. It is ideal for automatically maintaining the correct level in liquid environment using the correct sensor style and type including but not limited to towers, storage tanks, or process water applications.Waterline Controls is a registered trademark of SDI. NINA Liquid Level Controls may look like the competition but the unit is revolutionary in its design. The NINA is perfect in any application where water level management is important. It uses a microprocessor that monitors all probes for correct operation and then provides the corresponding outputs to drive thedry contacts. By using a very low voltage and current, NINA probes never foul or degrade whenever using solid state sensors like the ones we offer.