Clef du Vin Pocket Wine Aging Key Wine Age Tool w/ Leather Holster Unique patented device, widely acclaimed in Europe and Asia. Pocket size with a handy carry chain. Pocket Model with Leather Holster Case and Instructions. Made in France. Lets you see the future of any wine. Determines the ideal length of time to cellar wines Tested by scientists and sommeliers in France for more than 10 years before being introduced in the U.S. The amazing & definitive true wine diagnostic ageing tool! Actually ages wine 1 year for every second the tool is submerged in the wine. Indispensable tool for the serious wine collector, winemaker, or wine salesman