Which two key pieces of information are found on a Nitrox fill tag?

The key pieces of information found on a Nitrox fill tag are the fraction of oxygen (FO2) in the gas mixture and the maximum operating depth (MOD). FO2 indicates the percentage of oxygen in the blend, which is crucial for understanding how the gas behaves and determining the appropriate limits for safe diving. The MOD, on the other hand, is the deepest depth at which the gas mixture can be safely used to avoid oxygen toxicity.

In the context of diving, knowing both the FO2 and MOD is essential for planning dives and ensuring diver safety. The FO2 helps divers calculate their exposure to oxygen at different depths, while the MOD provides a clear guideline for avoiding depths where the partial pressure of oxygen would exceed safe levels. This combination of information is vital for making informed decisions about dive profiles.

While other options may contain relevant information, they do not encompass the essential elements necessary for safe Nitrox diving. For example, a dive location or a diver's name might be useful for record-keeping but does not provide the critical safety data that is required for dive planning.