The watch includes a number of different preset times that you can select for the countdown start time. I did the same on my B640W initially with the mobile phone screen protector (see photo). The problem with these films is that they are not meant for continuous exposure to water. After all, you don't dip your phone into the water, do you? ;-) So every time I washed my hands, the watch would be exposed to water. After a few times, the film would simply fall off. So eventually I abandoned the idea, and just let it scratch. I think at least for some Casio watches, the formulation for the acrylic crystal is pretty scratch resistant. So far both my B640W and DB36's crystals are holding up pretty well.

Casio AE1200, Part 1: The Review - The Time Bum Casio AE1200, Part 1: The Review - The Time Bum

If you're up for a bigger watch, you might consider the AE-2000. All digits and characters are bigger and easier to read than on the AE-1200. I own and like both of them. In the Timekeeping Mode, hold down A until the seconds start to flash, which indicates the setting screen.I have an ae1200. It is not suitable for rough use. The crystal is exposed and slightly protruding. Soon it will be full of scratches. The AE1200 watches are exceeding clever, super cheap, and all my digital-bashing aside, rather nice looking too. But there is one more thing. You can easily modify them, even going so far as to give them steel cases. As you can see in the first photo, I’ve already started down that road…

AE-1300 — All about Casio Watches - CasioFan Magazine

The first thing I noticed was how light the Casio is. I think the battery may well be the heaviest part of this watch. For those of us accustomed to wearing automatics and big divers, it can be a little disconcerting, particularly since it doesn’t look small. It is nearly 42mm wide, excluding the four buttons (41.8mm to be precise), and that is pretty darn big for a square watch, but short lugs bring its overall length to just 45mm, which is a tidy fit on my 6.75″ wrist. A 12.6mm case height doesn’t hurt either. In the end, you have a compact watch that still has enough room to display a ton of information. The display frame comes right out too. Too many words? Then erase them with the same tools and technique you used on the case. Some folks have cut away the crossbars that separate the displays, but I don’t think that’s a great look.I'll include a pic below so that you'll know what I am talking about. Given below is a pic of GD-100-1BDR on my wrist.(Really loved that watch but couldn't get it since it was too big for me) So, the "day display" on 1200 is readable enough right? (The time and date are bold enough, and pretty clear)