A jigger is, in essence, a miniature measuring cup that can help you nail the ratios of spirits and mixers. When we tested them, our favourite was really a miniature measuring cup from OXO. But for a far more common jigger, you can't defeat this one particular from Piña Barware. https://jeffreynjtvn.thenerdsblog.com/43282880/little-known-facts-about-shaker-cabinets