New versions of Depth Gauge and Air Depth are in the publishing queue at the iPhone App Store.

New in this version:

1. The Nitrogen slider's visibility is controlled by a new setting: "Show Nitrogen %".
2. When visible, the Nitrogen slider is completely disabled and faded.
3. New gas icons replace the labels to the left of each slider.
4. Localización española

UPDATED: Apple is taking a good long while to approve this update, in the meantime I've added Spanish localisation.