Photomonage of <a href="https://en.wikipedia.org/wiki/Nitrox" class="extiw" title="en:Nitrox">Enriched Air Nitrox</a> diving tables, which is a safety tool nowadays obsolete in its original use under water, but still used for previous dive <i>planning</i>, backup, and training purposes, and a diving watch Citizen Promaster Eco-Drive BN0015-07E Diver's 200 m, a professional diver's watch on a silicone strap, and a depth meter from a photo where it is worn by a military diver from the US Marine Corps. NOTE: For illustrational reasons, the things are not completely at the same scale with respect to each other - the diving watch is a bit too large, while the depth gauge is a bit tool small.
<ul><li><a href="//commons.wikimedia.org/wiki/File:Nitrox_tables.JPG" title="File:Nitrox tables.JPG">File:Nitrox tables.JPG</a>: --<b><a href="https://en.wikipedia.org/wiki/User:Legis" class="extiw" title="en:User:Legis">Legis</a></b> <small>(<a href="https://en.wikipedia.org/wiki/User_talk:Legis" class="extiw" title="en:User talk:Legis">talk</a> - <a href="https://en.wikipedia.org/wiki/Special:Contributions/Legis" class="extiw" title="en:Special:Contributions/Legis">contribs</a>)</small></li>
<li><a href="//commons.wikimedia.org/wiki/File:Citizen_%22Orca%22_200m_titanium_Diver_watch_(turned,_without_background).jpg" title='File:Citizen "Orca" 200m titanium Diver watch (turned, without background).jpg'>File:Citizen "Orca" 200m titanium Diver watch (turned, without background).jpg</a>: * <a href="//commons.wikimedia.org/wiki/File:Citizen_%22Orca%22_200m_titanium.jpg" title='File:Citizen "Orca" 200m titanium.jpg'>File:Citizen "Orca" 200m titanium.jpg</a>: Guillaume PILLET</li>
<li>derivative work: <a href="//commons.wikimedia.org/wiki/User:Pittigrilli" title="User:Pittigrilli">Pittigrilli</a></li>
<li><a href="//commons.wikimedia.org/wiki/File:USMC-17563.jpg" title="File:USMC-17563.jpg">File:USMC-17563.jpg</a>: This file is lacking author information.</li>
<li>derivative work: <a href="//commons.wikimedia.org/wiki/User:Pittigrilli" title="User:Pittigrilli">Pittigrilli</a></li></ul>
CC BY-SA 3.0
<p>This file was derived from:
</p>
<ul><li> <a href="//commons.wikimedia.org/wiki/File:Nitrox_tables.JPG" title="File:Nitrox tables.JPG">Nitrox tables.JPG</a>: <a href="//commons.wikimedia.org/wiki/File:Nitrox_tables.JPG" class="image"><img alt="Nitrox tables.JPG" src="https://upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Nitrox_tables.JPG/50px-Nitrox_tables.JPG" decoding="async" width="50" height="31" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Nitrox_tables.JPG/75px-Nitrox_tables.JPG 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/3/3e/Nitrox_tables.JPG/100px-Nitrox_tables.JPG 2x" data-file-width="1049" data-file-height="656"></a></li>
<li><a href="//commons.wikimedia.org/wiki/File:Citizen_%22Orca%22_200m_titanium_Diver_watch_(turned,_without_background).jpg" title='File:Citizen "Orca" 200m titanium Diver watch (turned, without background).jpg'>Citizen "Orca" 200m titanium Diver watch (turned, without background).jpg</a>: <a href="//commons.wikimedia.org/wiki/File:Citizen_%22Orca%22_200m_titanium_Diver_watch_(turned,_without_background).jpg" class="image"><img alt='Citizen "Orca" 200m titanium Diver watch (turned, without background).jpg' src="https://upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Citizen_%22Orca%22_200m_titanium_Diver_watch_%28turned%2C_without_background%29.jpg/50px-Citizen_%22Orca%22_200m_titanium_Diver_watch_%28turned%2C_without_background%29.jpg" decoding="async" width="50" height="59" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Citizen_%22Orca%22_200m_titanium_Diver_watch_%28turned%2C_without_background%29.jpg/75px-Citizen_%22Orca%22_200m_titanium_Diver_watch_%28turned%2C_without_background%29.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/c/c7/Citizen_%22Orca%22_200m_titanium_Diver_watch_%28turned%2C_without_background%29.jpg/100px-Citizen_%22Orca%22_200m_titanium_Diver_watch_%28turned%2C_without_background%29.jpg 2x" data-file-width="2800" data-file-height="3300"></a></li>
<li><a href="//commons.wikimedia.org/wiki/File:USMC-17563.jpg" title="File:USMC-17563.jpg">USMC-17563.jpg</a>: <a href="//commons.wikimedia.org/wiki/File:USMC-17563.jpg" class="image"><img alt="USMC-17563.jpg" src="https://upload.wikimedia.org/wikipedia/commons/thumb/7/77/USMC-17563.jpg/50px-USMC-17563.jpg" decoding="async" width="50" height="75" srcset="https://upload.wikimedia.org/wikipedia/commons/thumb/7/77/USMC-17563.jpg/75px-USMC-17563.jpg 1.5x, https://upload.wikimedia.org/wikipedia/commons/thumb/7/77/USMC-17563.jpg/100px-USMC-17563.jpg 2x" data-file-width="4800" data-file-height="7227"></a><br></li></ul>