What equipment is required for scuba diving?

Scuba diving requires
* An air (or enriched air) tank
* Breathing device - typically an open circuit regulator  or a closed circuit rebreather
* Buoyancy Control Device (bcd)
* Depth gauge
* Submersible Pressure Gauge
* Dive Computer or Watch
* Mask
* Fins
Optional equipment
* Wetsuit
* Weights
* Surface Marker Buoy
* Dive Light