A new electromechanical liquid-level measurement system, able to achieve measurements on micron sensitivity, is presented in this study. A simple stepping motor provides vertical movements to electrodes sensing the water level. A microcontroller installed on the system determines the number of steps executed by the motor when electrodes move between an upper reference plane and the level of the liquid to be measured below the reference plane. This number is transformed, by the micro-controller, to the depth of the liquid level relative to the reference plane. The system is particularly useful for the detection of liquid level changes. The level sensor can be used, not only for precise water level measurements, but also for other non-explosive and non-flammable liquids and for conductive solid surfaces. Besides this, changes in water levels in natural lakes and in dam lakes, and fluctuations of the groundwater in wells can be sensitively detected by this sensor.