Wine dispensers with argon or nitrogen preservation — 2- to 8-bottle units that pour wine by the glass and keep an open bottle pouring for weeks instead of a day or two.
Inert gas blankets the wine, so an open bottle keeps pouring for weeks rather than the day or two it lasts on a shelf.
Both displace oxygen and work well; argon is heavier and settles on the wine, nitrogen is cheaper to refill. Either suits by-the-glass service.
Self-serve models meter a taste, half glass or full glass against a card, which suits tasting rooms and hotel lounges.
