As an expert sommelier and brewer, I have come across various types of shot glasses in my career. When it comes to double-sided shot glasses, they typically come in two common sizes. The most common size is a jigger that measures 1.5 oz. on one side and 0.75 oz. on the other side. This size is widely used in bars and restaurants, as it allows for easy measurement of standard shot quantities.
I have personally used these 1.5 oz./0.75 oz. jiggers in my work, and they are extremely convenient for preparing cocktails and measuring spirits accurately. The larger side, which holds 1.5 oz., is perfect for pouring standard shots or creating stronger mixed drinks, while the smaller side, measuring 0.75 oz., is ideal for measuring half shots or creating lighter cocktail recipes.
However, it's worth mentioning that there are also slightly larger double-sided jiggers available, measuring 2 oz. on one side and 1 oz. on the other side. These jiggers are less common but can be found in some specialty bars or used by mixologists who prefer larger pour sizes. They offer a bit more flexibility in measuring larger shots or creating cocktails with a higher alcohol content.
In my experience, the choice of jigger size often depends on the preferences of the bartender or mixologist. Some may prefer the standard 1.5 oz./0.75 oz. jiggers for their versatility and accuracy, while others may opt for the larger 2 oz./1 oz. jiggers to accommodate specific recipes or personal pouring style.
To sum it up, the most common double-sided shot glass, or jigger, measures 1.5 oz. on one side and 0.75 oz. on the other side. However, slightly larger jiggers measuring 2 oz. on one side and 1 oz. on the other side are also available. The choice of jigger size ultimately depends on the individual's pouring preferences and the specific needs of the cocktail recipes they are working with.