There are many types of gauges on the market. These include Analog, Digital and Pneumofathometer models. Choosing a gauge that fits your needs is essential for ensuring a safe dive. Keeping your gauge calibrated is also vital for decompression safety, especially at altitudes.
Analog gauges
Analog gauges for gauge diving can help divers understand the depth in the water. The gauges work by rotating a graduated scale around the needle to indicate depth. These gauges can either be worn on the wrist or integrated in the dive computer. The analog ones may be more reliable than digital gauges, but they are not completely accurate. An advantage of an analog gauge over digital is the fact that you never run out.
The gauge's display is easy to read. It comes with numerical increments of depth that range from 10' - 40' and 20'- 150'. The gauge has a pressure indicator. It can display pressure from 0 - 5000 psi. A red screen means reserve air, and a green screen means main air.
Digital models
Many divers desire to dive deep and stay there, but a digital gauge can't be used. Temperature fluctuations can alter the pressure difference between your gauge and the surrounding water. Fortunately, a mechanical gauge is much safer than an electronic gadget. 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 for digital gauge dive computers. The hose technique is the simplest. It uses a hose for connecting the dive computer to a high-pressure port on stage 1. Wireless mode, on the contrary, attaches an electronic transmitter to the first stage to communicate to the computer. You can also find this type of diving computer in console or wrist-mounted models.
Pneumofathometers
Pneumofathometers are devices used to gauge the depth of air supplied to a diver. These devices measure the air pressure near the surface and then display the depth in feet (or metres). In the past, these devices were mounted on the hand-cranked air pump that supplied breathing air to the standard diving suit. The air supply was unrestricted and free-flowing.
A gauge should have a range between 130 and 160 percent of the maximum operating pressure for gauge diving. This range is sufficient for systems operating at 3,000 psi and more.
Submersible pressure gauges
A submersible pressure gauge (SPG) is a device that allows scuba divers to keep track of their air pressure. It can display current depth and indicate the direction in which the diver is moving. The SPG is usually attached to the regulator via a high-pressure hose. This arrangement makes it easy for the diver to locate the gauge easily and prevents it from becoming lost. A SPG measures the remaining air pressure per square inch. It is used to monitor your air supply while diving.
Scubapro makes an oil-filled analog depth gauge that measures up to 200 feet. It has a Bourdon tube design and is oil-filled. For greater versatility, it also includes a C1-compass that attaches to its console boot. This gauge is best suited for beginners because it is simple and easy to use.
Compass
Easy to read compass is the best for gauge diving. The compass should be large enough to be read underwater and be marked with the appropriate markings. You will want a compass that has a bezel with indicator marks at every five degrees and compass headings in increments of 30 degrees.
Side view windows are important for gauge diving. They allow the diver to see where the compass points. This allows the diver even in complete darkness to follow the course of the compass.