There are various types of gauges available on the market. There are three main types: Analog, Digital and Pneumofathometer models. For safe diving, it is crucial to select a gauge that meets your requirements. It is important to calibrate your gauge at all altitudes for safety decompression.
Analog gauges
Analog gauges used for gauge diving are useful in helping divers determine the depth of water. The gauges work by rotating a graduated scale around the needle 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. An advantage of an analog gauge over digital is the fact that you never run out.
The gauge's face is easy to read. It features numerical increments of depth from 10' to 40' and 20' to 150'. The gauge has a pressure indicator. The gauge displays pressures from 0 to 5500 psi. The screen displays reserve air and the green screen 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. 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 basic types for digital gauge dive computers. 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. 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 surface air pressure and indicate depth in meters or feet. 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 free-flow, with no back-pressure.
For gauge diving, divers should buy a gauge that is between 130-160 percent of the maximum operating temperature of their diving system. This range would be sufficient for systems operating at more than 3,000 PSI.
Submersible pressure gauges
A submersiblepressure gauge (SPG), allows divers to keep track and monitor their air pressure. It also displays the current depth and the direction the diver is moving. The SPG connects to the regulator using a high pressure line. This arrangement is useful for divers to avoid getting confused about the location of the gauge and helps prevent it from being lost. A SPG shows the remaining air pressure in pounds per square inch and is useful for monitoring 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 ideal to beginners, as it is simple and straightforward to use.
Compass
Easy to read compass is the best for gauge diving. It should be large enough that it can be read underwater, and the right 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 see the direction that the compass is pointed even in complete darkness.