What is the primary purpose of the contents tag on a nitrox cylinder?

The primary purpose of the contents tag on a nitrox cylinder is to ensure proper identification and handling. This tag provides essential information about the specific gas mixture contained within the cylinder, such as the percentage of oxygen and nitrogen, which is crucial for divers to know before using the cylinder. Proper identification helps prevent mix-ups that could lead to dangerous situations, such as using a cylinder with the wrong gas for a dive. Additionally, it communicates safe handling practices, ensuring that individuals know how to treat the gas appropriately, particularly considering the increased risks associated with higher oxygen levels in nitrox mixtures.