A cocktail measure, or jigger, is a tool used to measure liquor for cocktails. It is a small, cylindrical cup with a spout and a handle, typically holding 1.5 fluid ounces, or 44 milliliters.

A jigger can be used to measure either a single shot of liquor or a double shot. To measure a single shot, fill the jigger to the top of the spout. To measure a double shot, fill the jigger to the bottom of the spout.

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