Jigger (bartending)

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A jigger (pen included for scale)
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A jigger (pen included for scale)

A jigger or measure is a bartending tool used to measure liquor, which is typically then poured into a cocktail shaker. It is named for one of the units it measues, a 1.5 fluid ounces (~44 ml) jigger or shot. Typically it is an hourglass shape, pairing a jigger on one side with a 1.0 fl. oz. (~30 ml) pony (shot) on the other. However bartending jiggers come in other sizes and may not actually measure a fluid jigger.