I created this stopwatch simulation looks like a real stopwatch. If we display digital numbers students cant not learn how to read stopwatch. Instead of displaying numbers, if we let student to note the seconds hand and minutes hand they can learn much more (thats my thought). The main aim of the simulation is "resuable stopwatch". If someone need stopwatch in their simulation, then there is no need of writing code. They just copy and paste this stopwatch code. This is portable stopwatch.

My future work:

I am going to reduce computational cost. Currently, stopwatch 300 second hand ticks creating by for loop. So it takes more computation. And fixed relation also takes more computation. 

And, I am going to implement magnifier. If suppose, student want to see exact ticks where the hands stops the magnifier will help. So I need your all helps.