There are many different types of gauges that are available. There are several types of gauges, including analog, digital and pneumofathometer models. A gauge that is right for you is key to a safe dive. Your gauge must be calibrated at all times, especially when diving at high altitudes.
Analog gauges
Analog gauges for gauge diving can help divers understand the depth in the water. A graduated scale is used to indicate depth. These gauges can be worn on a wrist or integrated into the dive computer. The analog ones may be more reliable than digital gauges, but they are not completely accurate. One advantage of using an analog gauge is that you will never run out of batteries.
The gauge's face 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 displays pressure between 0 and 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 changes can affect the pressure difference between the gauge's water and the ambient. A mechanical gauge is more reliable than an electronic device. A mechanical gauge is safer than an electronic gadget. It can track your dive time and depth as well as calculate your Nitrogen retention. This will help to prevent decompression illnesses.
There are two main types of digital gauge diving computer. The hose method uses a hose to link the computer to the first stage's high-pressure port. The wireless mode connects to the dive computer using an electronic transmitter attached at the first stage. This type of computer can also be found in console and wrist-mounted versions.
Pneumofathometers
Pneumofathometers allow you to determine the depth of oxygen supplied to your diver. These devices measure the air pressure near the surface and then display the depth in feet (or metres). These devices were originally mounted on a hand-cranked pump that supplied breathing oxygen 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. A gauge with this range would suffice for a system that operates at 3,000 psi or more.
Submersible pressure gauges
A submersible Pressure Gauge (SPG), is a device that allows divers to track their air pressure. It can display current depth and indicate the direction in which the diver is moving. The SPG connects to the regulator using a high pressure line. 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. You can attach the C1 compasses to your console boot for additional versatility. This gauge is best suited for beginners because it is simple and easy to use.
Compass
It is important to be able to read the compass easily when gauge diving. It should be large enough that it can be read underwater, and the right markings. A compass should have a bezel that contains compass headings organized in 30 degree increments, and indicator marks for every five degrees.
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, even in total darkness, to follow the compass's course.