Do not waste time and money. Buy directly 4TOOLS HD. Four applications in one: Bubble Level, Timer, Ruler, Torch. This wonderful app will allow you to have all the major utilities, all included in one single application!!! + Bubble Level: You will measure if everything around you is flat. + Timer: Beautiful countdown application. + Ruler: Use your iPad as ruler. Fantastic Wallpapers. + Flashlight: Illuminate dark environments with the magnificent layout torch. Well ... 4 Tools, all in only 1 great App.