There are a few basic types of liquor pourers. Typically, pourers are either free-flowing or measured. Free-flow pourers pour liquor freely, continuously pouring while the bottle is turned at an angle. Measured pourers include a tiny ball bearing which measures out a precise amount of liquor during every pour, stopping after that amount is poured. Measured pourers typically make easy work of pouring accurate amounts. Some bartenders, however, have been trained to pour "by count" and are able to determine the exact amount of liquor they are pouring simply by counting as they pour. Experienced bartenders learn to do this consistently and accurately. And consistent, accurate pours are good for the business as well as customers.