This is very easy to use.
Just click on the app icon and your Floating widget will be activated (even after you close the widget, you can always restart it with the same procedure!).
I always wondered, that whenever I wanted to measure time or wanted to keep an eye on time with respect to seconds, I wanted a widget of time with seconds figures.
So, here I am presenting digits tweening clock widget for android.
9Apps 4.9
