Look for graphic displays. Nitrogen loading or time available and ascent rate are the most important data on a non-air integrated computer and should be readily available at all times. Look for the ability to easily change the no-decompression limits, therefore making the computer more conservative when you need to. You should be able to do this in the field, either by changing a setting before the dive, or by the use of a graph during the dive. Every computer tested here offers this capability.
Lockouts take control away from the diver.
All others go into gauge mode, giving only depth and time, and not decompression information. Simple, small, waterproof cue cards remind you how to use your computer. In time, you will likely forget how to use some of the functions on your computer, especially those rarely used. And with so many different computers available, don't assume that your dive guide or someone else on the boat will be familiar with your particular computer. At this time, most of these interfaces are fraught with problems and are difficult to use.