We usually say above the thermometer for portable thermometer and a probe thermometer, or according to the use function, food thermometer, kitchen thermometer, because it is with a barrel, also known as barrel temperature, or is a thermometer. These color barrel belongs to bimetallic thermometer thermometer, bimetallic thermometer is one with two or more pieces of metal laminate composed of multilayer metal together, using two different metal working in the principle of expansion degree of different temperature changes. Because no mercury pollution, convenient use, etc, are widely accepted in the industry and food industry. In, there are 7 kinds of color, barrel, respectively is red, white, green, yellow, blue, black. The default match red barrel, customers can also according to their need to purchase!