Simply a must-have for the avid baker, the Baker's Oven Thermometer lets you know the constant temperature of your oven throughout the cooking process-measuring from 112 to 572 degrees fahrenheit. The easy-to-read LCD display shows elapsed cooking time, target temperature and constant average of the actual oven temperature. This revolutionary thermometer recalculates and updates this average every 10 seconds, and compares it to the set target temperature. What's more, it alerts you if the temperature swings 15 degrees above or below your target temperature. Measurements are taken by using a probe sensor with oven rack clip and insulated metal wire that psses between the oven door seal back to the unit. With some ovens varying as much as 50 degrees fahrenheit from the set temperature on the dial, you can be assured that your cooking at the correct temperature every time. Additional features include a 20 hour count-up or count-down timer, detachable stand for countertop use, and magnets on the back for stickng to metal surfaces. Includes 1 AAA battery.