How can divers accurately determine the oxygen content of their EANx mix?

Using an oxygen analyzer before the dive is the most reliable method for divers to accurately determine the oxygen content of their EANx mix. An oxygen analyzer specifically measures the partial pressure of oxygen in the gas mixture, allowing divers to confirm that the mix is within safe and planned limits for their dive profile. This ensures the correct blend prior to any dive activity, helping to prevent issues such as oxygen toxicity or improper gas management.

Visual estimation lacks precision and cannot provide the necessary specificity needed for safe diving practices. Similarly, while a depth gauge is crucial for monitoring dive depth, it does not measure gas composition, which is essential for understanding the risks associated with different oxygen levels at depth. Depending on a buddy's input is also unreliable; dive planning and gas analysis should be conducted individually and precisely rather than relying on someone else's interpretation or experience.