54.7 millimetres
By Kenji Watanabe, Osaka ยท
Yes, the title is the review, more or less. 54.7 mm wide and 15.7 mm thick. This is a large instrument, not a wristwatch in the ordinary sense, and Casio built it for people who work in mud, dust and rain.
Inside is Module 5631, a triple-sensor setup with compass, altimeter, barometer and thermometer, plus solar charging and radio sync. The carbon core guard case keeps it lighter than you would expect for the size, and the sapphire crystal is a pleasant surprise on a G-Shock. The resin strap is 24 mm and comfortable.
Who should buy it? Hikers who want the sensors without a smartwatch, field engineers, anyone who climbs Rokko on weekends and likes to know the pressure is dropping before the rain does. Who should not? Anyone who wears shirts with cuffs. It will not fit under them, not even close.
I like it a great deal as an object. I just cannot imagine wearing it on the Midosuji line without bumping someone.