Dive safely, dive deeper for longer, less deep smoke. A lower nitrogen content in the breathing gas reduces the potential dangers when diving. A must have for every ambitious scuba diver. You can do all the theory in the comfort of your own home. You only have to invest about 30 minutes for the practical course in our Divecenter. We will show you how to analyze the tank contents, how to label the tank and how to fill out the filling logbook.