The Comark - 550B - -40 - 550 degrees F Digital Thermometer gives great readings between 40 below and 500 degrees. It's perfect for fryers and allows for digital readouts that are easy to determine. The water-resistance on the 550B thermometer gives you added protection. You want golden brown items coming from your fryer, and you can get that every time when you keep an eye on the temperature with help from the Comark -40 - 550 degrees F Digital Thermometer (550B).