Choosing a dive computer is an important decision, especially when you are buying your first one. There are many models available, with different designs, displays, features and prices.
This is one of the most common questions among divers during a diving course or a test dive. Air consumption depends on several factors.
The air that we breathe at the surface and the air from a scuba tank have the same mixture gases, 21 percent oxygen and 79 percent nitrogen, minus some traces of other gases.