The first thing you must have before you dive is a properly fitting wet suit. Wet suits protect you from the surrounding water temperature. They trap a minimal amount of water between the suit and your skin in order to keep your body at a comfortable temperature. Wet suits come in a variety of colors, styles and features from which to choose. You should consider the waters you will be diving in, then choose a suit with the appropriate amount of insulation. Some wet suits come with multiple pieces, which is handy for layering in cooler waters. You may also want to add accessories such as booties, a hooded vest or gloves.
A scuba unit consists of the following items: a regulator, tank and buoyancy control device. A regulator is very important as it regulates your air supply during a dive. The tank is what holds your air supply. Tanks can be either steel or aluminum. Steel is usually a little more compact, and aluminum requires more maintenance. When selecting a tank, choose one that correlates with your air consumption and works specifically with your diving objective. It is also important to take the appropriate safety consideration into account. The buoyancy control device can be used as a harness, but its main purpose is to allow you to float and descend when you want.
A dive computer calculates the amount of nitrogen that dissolves into your body at various depths. It also shows you acceptable depths and times you need to stay within to prevent dangerous amounts of dissolved nitrogen from occurring.
Every diver needs a mask to clearly see the surroundings. Choose a mask with tempered glass because plastic fogs, and other types of glass may shatter. Also make sure that the mask's nose is connected to the eye pockets to allow for pressure changes. A few other features to consider include a canted-in bottom, purge valve and a wide strap.