A digital thermometer is a temperature-sensing instrument that provides a digital display of the temperature reading. It is a widely used item of temperature-measuring equipment that significantly overhauls and updates the traditional thermometer. Digital thermometers come in a variety of shapes and sizes, and they are easily portable, have permanent probes, and a convenient digital display. They use thermistor resistance that varies with temperature or an infrared sensor composed of pyroelectric film to measure temperature. Digital thermometers are commonly used in the home to measure body temperature, and they can be used to record temperatures from the mouth, armpit, or rectum. Armpit temperatures are the least accurate, while rectal temperatures provide the most accurate readings for children between 3 months and 3 years of age. Other types of digital thermometers include temporal artery thermometers, ear (tympanic) thermometers, and fever strip thermometers. Digital thermometers provide faster, more convenient measurements and eliminate the environmental hazard of mercury in legacy thermometers. They are used wherever temperature measurements are required, and different types of thermometers are conceivable.