Aire Underwater Square Dive Computer

I can't write too much about todays "watch" as I can find anything about it online, and the instruction manual is in Japanese. It is a wrist mounted device that tells the time, so it fits in my collection (just), but it is a little on the large size to use as just a watch.

It seems that there are two Aire dive computers online, the Underwater Square, and the B.U.G. The Aire models can't be easily found online with no makers  site being linked. Using the phone number on the manual links to the company Scubapro Uwatec Japan (who are registered as diving computer suppliers), so I'm guessing this is the company who originally made these models.

A dive computer is used during diving to measure time and depth so the diver can calculate their ascent to avoid decompression sickness (as a dive computer is also called a personal decompression computer or a decompression meter). The computer can be set with the dive plan, and will normally show dive time, depth, max depth, and time at current depth without needing decompression stops.

The Underwater Square is a huge, rectangular box with a large LCD display. The strap is very long and designed to go around the outside of your wetsuit (or drysuit). Normally, it shows time at the top, and there are plan and log buttons for setting the dive, and reviewing dives.

It seems to have come out in the 2000s (maybe 90s), but isn't available anymore. The battery is well enclosed and there are 8 screws before you reach the CR3032 (although you should take it to a specialist to make sure it remains watertight).