<P> Thermometers used specifically for low temperatures . </P> <Ul> <Li> Ear thermometers tend to be an infrared thermometer . </Li> <Li> Forehead thermometer is an example of a liquid crystal thermometer . </Li> <Li> Rectal and oral thermometers have typically been mercury but have since largely been supersceded by NTC thermistors with a digital readout . </Li> </Ul> <Li> Ear thermometers tend to be an infrared thermometer . </Li> <Li> Forehead thermometer is an example of a liquid crystal thermometer . </Li>

Who invented the thermometer and in what year