1, mirror

　　This is something that divers must wear. And the choice of mask can not be sloppy, must be suitable for your face, prevent water. The main component of the mirror is composed of a transparent lens, a skirt and a headband.

　　If you are a fan of myopia and farsightedness, don't pick up and dive. Of course, the first sentence is false. Some brands specialize in mirrors for myopic and farsighted dive enthusiasts. Contact lenses are wearable when diving.

　　The types of mirrors are traditional diving mirrors, earmuffs and full covers. The traditional diving mirror can make your face look free of fog and fog, but it may enter the water. The earmuff type will help to balance the ear pressure. The full cover is Spider-Man's style, and the whole face is sturdy.

　　The main thing to buy a mirror is to consider the fit of the mask and face. Try to make the mask fit your face. Therefore, when buying, it is best to go to the physical store for an interview.

　　2, breathing tube

　　The composition of the breathing tube is very simple, one tube and one mouthpiece. The body of the snorkel is usually a semi-rigid plastic tube and the lower part of the mouthpiece is made of silicone. A suitable snorkel is also required to fit your face.

　　3, diving suit

　　In addition to watching its style and brand, diving suits are selected. The most important thing is to look at its practicality. Diving suits are divided into DiveSkin, WetSuits, and DrySuits.

　　Jellyfish clothes, as the name implies, are prevented from being bitten by jellyfish under water. Jellyfish clothes also have a role in sun protection. Wet clothes are more suitable for beginners in diving. The thickness of the wet clothes is between 1-5mm, and the most important function is cold insulation. Dry clothes are waterproof and impervious. More suitable for wearing in cold waters. Diving gloves and diving shoes are also available. Their function is also to ensure that divers will not be sunburned, bitten, cold, or destroyed.

　　4, BCD buoyancy control device

　　This is a big thing for life and death. The BCD buoyancy control device helps the diver to maintain balance in the water and to raise and lower the buoyancy device. BCD can be roughly divided into three different styles: rucksack BCD, vest BCD, and system BCD.

　　5, regulator

　　The regulator consists of a primary head, a secondary head, an alternate respirator, and a low pressure tube. Its function is to convert the high-pressure air in the cylinder into normal-pressure air. The first level head is connected to the gas cylinder and the second level head is connected to the respirator. The second level head is also divided into yoke and din, the difference is whether there is an O circle.

　　6, instrument group

　　The design of the instrument is diverse. Diving instruments can be divided into dive computer watches, residual pressure gauges, compasses, thermometers, etc. according to different functions. The following four diving instruments are introduced.

　　The dive computer is used to view the digital instrumentation of the dive time, cylinder volume, water quality environment and safety limits. There are two styles on the market: wrist straps and tube joints. The wristband is worn on the hand, and most wristband dive computers cannot detect the air pressure inside the cylinder. The tube-connected type is connected to the high-pressure outlet of the breathing regulator through a high-pressure hose, which can directly test the air pressure in the cylinder.

　　The residual pressure gauge and residual pressure gauge are the amount of air that can be monitored at any time. It is a high pressure pipe connected to the high pressure outlet of the regulator head. Different residual pressure gauges have different accuracy on the 0 scale. On the scale, a colored scale (green, yellow, red) is used to warn of the reduction in air volume.

　　The compass is a less-use digital dive instrument. When the diver is diving, pre-rotate the outer ring index so that the outer ring indicator is opposite to the pointer, so that the diver can keep moving in a straight line.

　　The thermometer, though not the basic diving instrument. But it is quite useful in providing information on water temperature, which can help divers determine what kind of wetsuit they need to wear.

　　7, ankle

　　The ankle is divided into an adjustment type and a foot type. Most of the time when diving, the foot-type is mostly used.

　　8, gas cylinder

　　Gas cylinders are divided into ordinary air bottles and high oxygen cylinders. Ordinary gas cylinders can maintain a dive of about 10 meters an hour. High oxygen cylinders can last longer because of low nitrogen content. But not a high oxygen cylinder is good, because the purity of oxygen is high, so there is a certain risk of poisoning, so beginners should not mess.