A jigger is, primarily, a miniature measuring cup that assists you nail the ratios of spirits and mixers. After we tested them, our favourite was essentially a miniature measuring cup from OXO. But for a more classic jigger, you can't beat this a person from Piña Barware. Simplicity and minimalism: https://shakercabinets52570.shoutmyblog.com/36355776/a-simple-key-for-shaker-cabinets-unveiled