1, mercury thermometer. Mercury thermometer is a traditional thermometer, made of glass, inside the rising body temperature with the mercury column. Mercury thermometers are characterized by accurate measurements, high stability and low price. The mercury is stored in a mercury bulb at the end. When the mercury is heated, it expands and rises along the very narrow glass tube. So, a small change in body temperature can cause a large rise in the mercury inside the glass tube. After taking your temperature, you have to shake the thermometer vigorously to get the mercury back inside the mercury bulb.
2, electronic thermometer. Electronic thermometer using the physical parameters of certain substances, such as resistance, voltage, current, etc., and the ambient temperature of the relationship between the existence of the determination of the body temperature in the form of digital display. Electronic thermometers are easy to read, have a short measurement time, do not contain mercury, and are harmless to the human body and the surrounding environment. Its shortcoming is that the accuracy of the display value is affected by the electronic components and battery power supply and other factors, not as good as the glass thermometer.
3, infrared thermometer. Infrared thermometer is through infrared light to measure body temperature, and electronic thermometer compared to the measurement speed faster, shorter time, can be divided into contact and non-contact two. Contact infrared thermometers are commonly found in ear thermometers, forehead thermometers, and multi-function thermometers, which can measure accurate body temperature from the ear in as little as one second. The most common type of non-contact infrared thermometer is the forehead thermometer, which can be limp to achieve the measurement of body temperature. Simply point the probe at the forehead, press the measurement button, and you'll get a measurement in just a few seconds, making it ideal for the acutely ill, the elderly, infants and children.
The above is about what kinds of thermometers are introduced, I hope the answer can help you.
The above is what I share with you about the thermometer types of related content, more information can be concerned about the construction world to share more dry goods