A depth gauge is a measuring tool used to determine the depth of a hole, body of water, or other surfaces. It typically consists of a graduated scale and a probe or rod that can be inserted into the material being measured. Depth gauges are commonly used in various fields, including construction, fishing, and scientific research. These tools can come in different forms, such as digital depth gauges or mechanical depth gauges, each designed for specific applications. Accurate depth measurement is essential for tasks like drilling, diving, and geological surveys, ensuring safety and precision in various activities.