Abstract: A water level and well depth measuring device includes a measuring probe, a control switch, a processing unit, an external power source, and a housing. The measuring probe is inserted into a well to determine a depth to a water level and a depth to a well bottom. An insulated cable, which connects the measuring probe and the housing, is used to lower the measuring probe into the well. The control switch, preferably a three-way switch, the processing unit, and the external power source are integrated into the housing. The control switch may be used to alternate between a level-measuring module and a base-measuring module of the measuring probe. The measuring probe is communicably coupled with the processing unit. Therefore, when the level-measuring module detects a water level and when the base-measuring module is at a well bottom, the processing unit activates a visual indicator and an audible alarm.