A depth gauge is a measuring instrument that is used to determine the depth of a particular object or surface. This device is widely utilized in construction, manufacturing, and mechanical industries. Synonyms for the term "depth gauge" include depth meter, depth finder, thickness gauge, depth measure, and depth indicator. These terms are interchangeable and can be used interchangeably depending on the context. Depth gauges can be mechanical, electronic, or digital, and they typically measure in millimeters or inches. They are designed to ensure accuracy in depth measurements, which is essential in several industries, including automotive, aerospace, and marine engineering.