A jigger, also known as a measure, is a bartending tool used to measure liquor. Jiggers come in different sizes, but a common size is 1 1/2 ounces. They are usually made of stainless steel or copper.

To use a jigger, fill it with the liquor you want to measure. Pour the liquor into the glass you are making the cocktail in. If you are making a shaken cocktail, hold the jigger in one hand and the glass in the …