Tonk's Talisman: Its Scarf

"My talisman?... Y-you mean my Scarf right?"

What would be Tonk's Talisman? 
Some form of mashine? a book on potions?
Why not its humble scarf?
Its been with Tonks as far back as it can remember hell maybe even before then.
Its always been a thing that Tonks wouldn't leave without and was always pretty much with it.

Sorry its not too flashy but i think its neet :D