How do you use a depth meter?

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I tried to use it but it won't work! I'm not exactly sure how to use it.
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How do you use a depth gauge ruler?
A depth gage is a very common hand tool used to inspect the depth of holes, slots, counterbores, recesses or the distance from one surface to another. They are especially common in the tool and die industry.How do you read a depth gauge on a boat?
depth finder, also called echo sounder, device used on ships to determine the depth of water by measuring the time it takes a sound (sonic pulse) produced just below the water surface to return, or echo, from the bottom of the body of water.How to use a depth micrometer
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Images: Andrea Piacquadio, RODNAE Productions, Saad Alaiyadhi, Saad Alaiyadhi