The Peugeot Wine Ageing Tool is a measuring device that can tell you instantly the keepability and aging potential of wine of any type. To use, simply take an initial sip of wine, then dip the disk in the wine and taste again. Every second of contact with the wine corresponds to one year of aging. If, after several contacts, the wine keeps its qualities, or if it improves, it has very good aging potential and is worth keeping. If the wine loses its precious qualities after just one or two seconds of contact, it has no keepability potential. Repeat this operation, second after second, until there are clear signs of decline in the wine to determine the aging potential.