A jigger is a fancy word for a cocktail-specific measuring cup. Not all jiggers are created equal, try as many styles as you can to find the one that suits your needs. We prefer Japanese Style jiggers because the margin for error is smaller, especially if you pour slightly over or under the recipe specs, because of the slim tapered design. Also, be sure to investigate the variety of measurements indicated on your jigger. Finding a jigger with an elusive quarter ounce mark is exciting indeed (and standard on our Cocktail Courier jiggers). The most important feature of jiggers are the markings that display the measurements, as not all measuring increments are standardized. Find one that has your most frequently used measurements. It's also important to consider the weight of the jigger and the slope of the taper.