Casio g-shock chronograph watches

EF-510BK-1AVDF

Casio Edifice Black Ion Alarm Chronograph Watch EF510BK EF-510BK

1/20-second stopwatch Measuring capacity: 59'59.95"
Measuring mode: Elapsed time
Accuracy: ±20 seconds per month
Approx. battery life 2 years on SR927W
Auto-calendar (28 days for February)
Daily alarms Date display Dual time
Regular timekeeping
Analog: 3 hands (timekeeping hour, minutes and seconds),
3 dials (timekeeping 24-hour, stopwatch minutes / 1/20 second and mode)
Size of case / total weight
EF-510BK 1AV 42.3 x 40.7 x 12.3 mm / 180 g

EF-517BK-1AVDF
Casio Edifice Black Chronograph Mens Watches EF517BK EF-517BK

Specification :
1/20-second stopwatch
Measuring capacity: 11:59'59.95"
Measuring mode: Elapsed time
Accuracy: ±20 seconds per month
Approx. battery life
2 years on SR927W
Date display
Regular timekeeping
Analog: 3 hands (Hour, minute, stopwatch second),
3 dials (timekeeping second, stopwatch hour and minutes)
Size of case / total weight
EF-517BK 1AV 46.0 X 40.0 X 12.8 mm / 151 g