Main-Sub Timer (com.cranberrygame.mainsubtimer) on Google Play
Main-Sub Timer is a timer which measures sub timers (three types of sub timers: timer,interval,stopwatch) in main timer.for example in main 60 minutes timer , you can measure sub timers (for example, 10 minute,10 minute,20 minute,20 minute).you can measure main and sub timers conveniently in all-in-one interface.