Countertop food merchandisers keep foods at preferred serving temperatures for hours for buffets, cafeterias, concessions, convenience stores, restaurants and cafes. They allow the merchant to showcase their product at point of sale and increase impulse purchases. Cabinets vary widely and offer features such as heated, refrigerated, dry or humidified. Humidity features can be as simple as water pan in the cabinet, to electronically controlled humidity levels. Cabinets also include features such as providing operator access only via the back, or doors front and back for self serve, or open air and air curtain.