This 9 Level Numeric Digital Counter Water Level Indicator employs a simple mechanism to detect and indicate the water level in a tank or any other water container. The level sensing is done by a set of nine probes which are placed at nine different levels on the tank walls (with probe 9 to probe1 placed in decreasing order of height, COM probe is placed on the base of the tank). Basically, level 9 represents the “tank full” condition while COM represents the “tank empty” condition.