What practical household thermometer?

In some western developed countries, the thermometer is almost home, air conditioners, refrigerators, cooking, barbecue, dining, and so on is indispensable, at home in addition to measuring temperature thermometer, even some people don't know use thermometer do? But with the improvement of living standards, more and more thermometer we recognize, and use, has gradually penetrated into everyday life. What is the most practical home thermometer? (of a liquid Mercury, alcohol) With mechanical ( The use of bimetallic strip) , electronic, and can measure temperature and humidity of the dry and wet bubble temperature. If indoors, suitable for indoor thermometer mainly alcohol thermometer, bimetallic thermometer and digital thermometer, mercury thermometer seldom used in room temperature measurements, because mercury is a poisonous substance. Household thermometer has measuring temperature and room temperature measurement: general clinical thermometer, Minimum scale 0. 1 degree Celsius) Measuring temperature not for reading. For example, 36. Eight degrees. Measured at room temperature thermometer ( Accurate to 1 c) Need for reading. For instance, 42. 3 c) That is 37. How four household thermometer is made of? Household thermometer generally have a mercury thermometer, alcohol thermometer. Heat bilges cold shrink are based on mercury or alcohol made from the original. Indicating rising high temperature, low temperature drop. Ordinary thermometer is made according to the principle of heat bilges cold shrink of the object. In a thin glass tube, put colored alcohol, when the temperature rises, the alcohol level rise, conversely, thus the change of the reaction temperature. Temperature, and life is closely linked, you can not pay attention to the principle of thermometer and technology, but it does influence the life of people!