According to construction there are different types of thermometer, they are: Clinical thermometer, Maximum and minimum thermometer,Laboratory thermometer
A clinical thermometer is used to measure the temperature of human body.
Maximum and minimum thermometer is used to measure the maximum and minimum temperature of a particular place within 24 hours.
Laboratory thermometer consists of a bulb with a long capillary tube.
The wall of the bulb is made thinner and the capillary tube is made narrower to make the thermometer more sensitive.