A jigger, also known as a shot glass, is a common tool used by bartenders to measure liquor. Most jiggers hold 1.5 ounces, although there are some that hold 2 ounces. When making cocktails, it’s important to use a jigger to measure the liquor so that the drink is consistent each time.

If you’re not sure how many ounces are in a jigger, it’s easy to measure. Fill the jigger with water and then mark the water level with a …