Divers can verify the ratio of oxygen to nitrogen in their nitrox tanks with a portable analyzer, though as you might expect, they aren’t exactly cheap. But if you’re confident in your own ...

Richer nitrox mixes of 40 to 80 percent O2 in small pony tanks are used for safety and decompression stops. Trimix Content: Variable mixture of Oxygen (O2), Helium (He) and Nitrogen (N2).