# Question: What is a gauge in scuba diving?

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The submersible pressure gauge informs you about the air you have remaining in your tank. The depth gauge lets you know how deep you are diving at any given moment. Both gauges give you accurate assistance for your dive experience while under water. A third instrument, which helps you under water, is the compass.

## What is a gauge dive?

A diving depth gauge is a pressure gauge that displays the equivalent depth below the free surface in water. The relationship between depth and pressure is linear and accurate enough for most practical purposes, and for many purposes, such as diving, it is actually the pressure that is important.

## What is a scuba pressure gauge?

Depth and pressure gauges measure the depth you are at, throughout your dive, along with accurate tank pressure, so that you know how much air you have left to consume and when you will need to start your ascent to the surface. Read More.

## How do submersible pressure gauges work?

Air pressure pushes against a diaphragm which in-turn pushes against the oil-filled tube, causing the coiled tube to expand like a filled garden hose. The tube end is attached to a fixed lever that turns the indicating needle which then indicates pressure on a graduated dial.

## What is a depth gauge called?

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.

## What does SPG mean diving?

SPG (Submersible Pressure Gauge): This is one you’ll want to keep your eye on while you’re underwater! Although the SPG is the device that indicates how much air is left in your tank, we use the term interchangeably to mean the whole console that contains your air gauge, depth gauge and sometimes a compass.

## What is a regulator in scuba diving?

The scuba regulator is a great invention that delivers the air from your scuba tank to you just the way you need it to breathe. A scuba diving regulator is the hub of your dive equipment, and links many pieces of gear – your scuba tank to your BCD, submersible pressure gauge (SPG), alternate air source and you.

## What is nitrox gas?

In the broadest sense, Nitrox is any gas blend of oxygen and nitrogen. Air, of course, is basically a nitrox mix of approximately 21 percent oxygen and 79 percent nitrogen. For divers, enriched air Nitrox is any gas blend with more than 21 percent oxygen.

## What is a DIN regulator?

A DIN (which stands for Deutsche Industrie Norm) regulator first stage has a threaded post that screws into the inside of the tank valve. A DIN regulator’s first stage fits into one side of the tank valve, and no additional metal or braces run behind the tank valve.

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## How does nitrox diving work?

How Does EAN Nitrox Work? Enriched air has more oxygen than air does, which reduces the percentage of nitrogen. As a result, you inhale less nitrogen throughout the dive than if you’re using regular air.

## What body system does decompression sickness affect?

Type I decompression sickness tends to be mild and affects primarily the joints, skin, and lymphatic vessels. Type II decompression sickness, which may be life-threatening, often affects vital organ systems, including the brain and spinal cord, the respiratory system, and the circulatory system.