Casio GB-6900B User's Manual For Watch Functions page 58

Stopwatch : Measuring unit: 1/100 second
Measuring capacity: 999:59'59.99" (1000 hours)
Measuring accuracy:
Measurement functions: Elapsed time, cumulative time, split times
Countdown : Countdown unit: 1/10 second
Timer Countdown range: 100 hours
Measuring accuracy:
Setting unit: 1 second
Time up alert: 10-second tone or vibration
±
0.0006%
±
0.0006%
E-57