Digi 1st T-810 9999 Hour/Minute Handheld Count Up and Countdown Timer Counts up to 99m 59s then to 9,999m or counts up to 99h 59m then to 9,999h Counts down from 99m 59s or 9,999m or Counts down from 99h 59m or 9,999h Views the time passing from start when the timer is running. Shows total elapsed time or overtime after time is over Time of day clock Lock feature prevents accidental modification