Thermometer is intended for temperature reading furnace, often inaccurately marked oven set. Incorrect oven temperature you can create all sorts of culinary chaos, gooey centers in bakery products for burning or drying of a wide range of products. Oven thermometers may vary in quality and Price. Spring style thermometer, available in most supermarkets can become unreliable, with a little push or permanent use. Mercury oven thermometer, available at gourmet supply stores, more accurate and reliable. See also the candy thermometer; refrigerator/freezer thermometer, meat thermometer.