This new thermometer is a must for the gas grill. The Maverick DIGITAL BARBEQUE THERMOMETER lets you know the constant average temperature inside your barbeque throughout the cooking process. What's more, it recalculates this average every 10 seconds, and compares it to the temperature target you have preset. It then alerts you if the temperature swings more than 15F (9C) above or below your target temperature. It updates this average every 10 seconds.The DIGITAL BARBEQUE THERMOMETER measures the temperature by using a probe sensor with grill rack clip, and an insulated metal wire that passes between the grill hood back to the unit. Grill knobs or air vents don't have very accurate temperature settings and when you open and close the hood the temperatures can vary up to 100 F (55C) from the temperature you think you set on the dial. Some grill hoods have anolog thermometers but they are not at the grill surface, and they are not as accurate as digital. If you don't know your temperature, barbeque results can be poor.