Timekeeper Time Calc в Android Market

Timekeeper Time Calc (v. 0.3) Разработано Hiroaki Matsumoto

An Android application for time calculation of practice, training, drill, and exercise; mental arithmetic calculation; as well as mental computation for timekeepers of TV and radio studios.

The timekeepers of TV, radio studios should calculate time in mind.
This application shows problems, you can solve them, and you can repeat this process to be a professional timekeeper.