At what point is it recommended to perform an oxygen content check?

Performing an oxygen content check before each dive is essential for ensuring safe diving practices when using enriched air (Nitrox). This check helps confirm that the gas mixture is within the acceptable limits for the planned dive profile. Nitrox has a higher concentration of oxygen than regular air, which can pose risks such as oxygen toxicity if the partial pressure of oxygen exceeds safe levels. Conducting the check before each dive allows divers to account for any potential errors in gas blending, leaks, or changes in the gas mixture that could arise since the last check. It is vital to verify that the tank contains the correct mix to maintain safe diving practices and prevent any complications during the dive. By consistently checking the oxygen content, divers can ensure they are well-prepared and informed before entering the water.