Watches don't come any more rugged than Casio's G-Shock models. EL backlight with afterglow. Countdown timer with input range from one minute to 24 hours. Accuracy within 15 seconds per month. One-second auto-repeat function. 1/100th second stopwatch with elapsed time, split time, and first- and second-place times. Hourly time signal. Auto calendar. Water-resistant to 660 ft.
Case Diameter: 1.8".