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Whats a jigger?

Cocktail jigger.
319WrLwmPBL._SL500_AC_SS350_.jpg

Good guess but no not it, that's for the image to clarify, I have used one before had no idea what it was called.

Hahaha, I'm learning new things here also!
This is a tough one I must say.

It's tougher than I thought given the first one was guessed in the first hour or so lol... I will reveal this weeks image tomorrow with another challenge. All SBD will be rolled over until next week.