There are many different types of gauges that are available. There are three types of gauges available: Analog, Digital, and Pneumofathometer models. Choosing a gauge that fits your needs is essential for ensuring a safe dive. Your gauge must be calibrated at all times, especially when diving at high altitudes.
Analog gauges
Analog gauges used for gauge diving are useful in helping divers determine the depth of water. You can use them to indicate the depth by turning a needle around a graduated scale. These gauges can either be worn on the wrist or integrated in the dive computer. While they are more reliable and accurate than digital, the analog ones can be worn on the wrist or integrated into the dive computer. An analog gauge has one advantage: you won't run out of batteries.
The gauge's display is easy to read. It comes with numerical increments of depth that range from 10' - 40' and 20'- 150'. A pressure gauge is also available on the gauge. It can display pressure from 0 - 5000 psi. The red screen represents reserve air, while green indicates main air.
Digital models
Divers want to dive long and deep. A digital gauge will not help them achieve this. Temperature changes can cause the difference in pressure between gauge and ambient water to change. A mechanical gauge is safer than an electronic one. Not only will it keep track of your dive times and depth but also calculate Nitrogen retention, which can help prevent decompression sickness.
There are two basic types of digital gauge diving computers. The hose technique is the simplest. It uses a hose for connecting the dive computer to a high-pressure port on stage 1. The wireless mode connects to the dive computer using an electronic transmitter attached at the first stage. This type can be used with console and wrist-mounted models.
Pneumofathometers
Pneumofathometers are devices used to gauge the depth of air supplied to a diver. These devices measure air pressure at the surface and then indicate the depth in feet or metres. These devices were used to be mounted on an air pump that provided breathing air for standard diving suits. The air supply was free-flow, with no back-pressure.
Divers who want to use gauge diving should purchase a gauge with a range of 130 to 160 percent of the maximum operating pressure of their diving system. This range is sufficient for systems operating at 3,000 psi and more.
Submersible pressure gauges
A submersible pressure gage (SPG), which allows scuba divers keep track of their pressure, is a device used by divers. It displays the current depth as well as the direction that the diver is moving. The SPG connects to the regulator using a high pressure line. This arrangement helps the diver avoid confusion and keeps the gauge from getting lost. The SPG indicates the remaining air pressure, in pounds per sq inch. It can be used for air supply monitoring while diving.
Scubapro produces an oil-filled analog depth gauge with a Bourdon tube design that measures to a depth of 200 feet. It also comes with a C1 compass, which attaches to the console boot for more versatility. This gauge is great for beginners as it is simple to use.
Compass
A compass that is easy-to-read is the best compass to use for gauge diving. It should be large enough for you to read underwater and with the correct markings. Look for a compasse with a bezel that includes indicator marks and compass headings.
A gauge diver's compass should have a side view window to allow them to see the direction it is pointing. This allows the diver see the direction that the compass is pointed even in complete darkness.