How to prevent currentValue from being reset to zero?

[SeanChense]

First thank you for your working at this to give us so amazing thing.
But I got a problem when I use it.

I wanna use this to get amounts of circle.It means when the currentValue becomes max I get first circle that is an hour.Then if it becomes the second max, I get second circle means two hours.

Now here, I don't know how to detect when is a circle is completed by user.
If the current won't be reset to zero, it will be easy for everything.

Could you help me?