Divers have a handy tool to measure how far underwater they are with the depth gauge. It indicates how many feet/meters deep you have descended. A ruler, for the ocean! Except now, instead of a ruler helping you measure things on land — it is the depth gauge that helps tells how deep are waters.
Similarly, if you go too deep with something like diving; Going ”full retard” can give you “the bends.” Some may suffer from gas gangrene, which is a deadly disease because it releases the gases within your body. You can get it if you head to the surface abruptly after being in deep underwater. And a depth gauge is one way to prevent this—from diving down too deep, too fast. It really comes in handy when you are diving and swimming deep!
A proper depth gauge should also be clear to read and very precise. Which basically means you can rely upon it to show you how deep, in depth of the water. It should also be robust enough to not break under the strain of being underwater, which is relatively heavy. You need a water-able depth gauge!
A depth gauge, and this is a great feature of it sitting on top cause its easy to read. The vast majority of depth gauges possess large screens which lets you observe your personal levels. A very helpful tool for you to use may be the fact that you can easily see your depth without any further immediate questions.
There are even depth gauges that use colors for better visibility of your obtained measure. So if it is green maybe you are at a depth that allows for more exploration, or whatever. If you see red, then it may actually be a sign to come up for air because you are at too low of a depth. This will enable you to better understand your surroundings when underwater.
Depth gauges come in all types, shapes and forms so feel free to choose! There are some simple, inexpensive examples and more complex ones that are expensive. It really just depends on what you need and how much money you can part with. Because we are all different, there is a depth gauge to match up when it comes to charging your style and budget.
If you're an experienced frogman, perhaps a more elaborate depth gauge with various functions. You can gain even more information from newer depth gauges that have a digital readout or sensors. They will have to provide enough support so that you can dive better and become safe underwater.