Using an oven thermometer seems unnecessary. Isnt my oven temperature gauge accurate enough?
Ovens vary in their heating method and temperature accuracy. Typically, the oven heat cycles on and off throughout a cooking cycle to maintain the desired temperature. So the actual temperature in the oven is not constant; in fact, it can vary significantly. A thermometer can help you adjust the temperature setting with respect to your ovens heating method. Older ovens are more likely to read an inaccurate temperature.