Time Calculations Time Management to the music production and broadcast professional to support stop watch. Also recommended for present and make a great gift for your. Stop watch function unit, 100 hours meter, timer function 1 second to 99 hours 59 minutes 59 seconds 1 seconds/time calculation function 60 tetsunoshin law/Add, Subtract, hour, minute, seconds and 60 keys and a 10-key tetsunoshin time calculation the law