iStop HD is a very easy, but extensive stopwatch app.

With iStop HD is it possible to record periods.

The rounding function allow you to arrange exactly the calculate periods, so you can better see differences in the flyback timings. Anymore you get the midpoint when you calculate the total measurement time and the rounding value.
For a better analysis all roundings are chart in a time-rounding diagramm.
For a optimal comparison of different measures is it possible to archive all measures in a database and to name individually so that these also can still be found clearly after a few weeks.

Functure summary:

Stop periods with roundings
Midpoint calculation
Storage of all measures

Application area:
Sport:
Endurance training, tracking of rounds and storage of the effort progress

Industry:
Creation of machine station time and station time diagramm

Fun:
Coverage the term to eat the biggest burger of the world
Appoint the numbers of beers at one evening with the total drinking time, single drinking time and the exact number of all beers