Editing Scuba set (section)

===Labelling of contents===
{{see also|Gas blending for scuba diving#Identification of cylinder contents}}
The composition of the gas in the scuba cylinder is analysed before use and recorded on a label on the cylinder. This is usually done directly after filling, when handing the cylinder over to the intended user, and when assembling the scuba set for use. The filler is responsible for ensuring that the mixture is within tolerance of the customer's specification, and the user, or in some cases the instructor, is responsible for ensuring that the mixture is suitable for the planned dive. Each person who analyses the gas is responsible for ensuring that the analysis matches the label on the cylinder. The default value is air, which does not always require a specific label. If the gas is air and the cylinder is identified for air only by colour code or labeling it man not be obligatory to analyse the contents.<ref name="SANS 10019:2008" />