Classic dial thermometers use a bimetallic spring-like coil attached to a a pointer. As temperature increases or decreases the pointer rotates around a fixed dial.
Classic bulb thermometers measure temperature through a glass tube sealed with a liquid that expands or contracts as the temperature rises or falls.
Digital thermometers offer easy-to-read displays and affordable pricing. Often including indoor/outdoor temperature, min/max memory and barometric pressure measurements.
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Unlike most such devices, the sensor is outside the case to ensure it measures the air, not your hand or pocket.
These analog thermometers measure temperature by using materials that change in some way when they are heated or cooled. The most common being the dial and tube types.
Temperature is one of the two most basic of weather variables (the other being humidity) and all of us are interested in what they are right now and what they will be in the future. Current and forecast temperatures help us plan our day and even the upcoming week or month. Long-range forecasts help various interests plan well into the future. To all of us, knowing the current and future temperature is important.
Analog thermometers measure temperature using either a bulb (tube thermometer) or a special spring (dial thermometer) in which a physical change occurs with temperature and is displayed on the scale of the device. Digital thermometers typically have an electronic sensor thats placed outside, which transmits its measurements to the indoor display by a radio signal. These digital thermometers have the advantage of being able to send and record data automatically and many are able to accept the inputs from multiple temperature sensors.