1-second stopwatch Measuring capacity: 29’59 Measuring mode: Elapsed time Regular timekeeping Analog: 3 hands (hour, minute, second), 3 dials (stopwatch seconds, 24-hour, stopwatch minutes) Accuracy: ±20 seconds per month Approx. battery life: 2 years on SR621SW Size of case / Total weight Size of case: 51.5×44×10.9mm Total weight: 160g