Flag/Visual indicator fir Chain break

[Slacker]

Anyone have an idea on what a simple but effective way to add a visual indicator to a stihl saw chainbreak?
I want to know on or off, just by looking.

Like the safety on most modern rifles.
Just look, no true need to touch to verify position.

 

[old guy]

A touch on the trigger tells you instantly.

 

[Slacker]

A touch on the trigger tells you instantly.

Haha! Yea, I'm trying to teach young folks good habits. Pulling the trigger to test the safety isn't what I'm after.