You might wonder why I’m talking about mechanical depth gauges in an era of high tech computers which are doing the same job more accurate with just a sensor. Also the PADI Open Water course you might teach or assist soon is designed to be taught with computers.
Like everything in life great things like computers have a history and you will have students who just can’t afford or won’t use one. Depth gauges and timing devices are the best back up we have if our computer malfunctions. For example Technical divers will always have their triple back up and they want to have their gauges as well as computers.
You as a PADI Professional will get the question one day; why do I need this depth gauge and how does it work?
First, we need to have a look which depth gauge is for what purpose and what are the benefits or downsides of each.