A **Digital Thermometer** is a common and indispensable medical device used for quickly and accurately measuring body temperature. Unlike older mercury thermometers, digital thermometers provide a safe, fast, and easy-to-read display, making them ideal for home use, clinics, and hospitals. They work by using **heat sensors** to detect body temperature and display the reading on a digital screen, often within seconds. Digital thermometers can be used orally, rectally, or under the armpit, depending on the model and user's preference. Many models come with features like a beeper to indicate when the reading is complete and memory functions to recall previous measurements. Their accuracy and ease of use make them an essential tool for monitoring health, detecting fevers, and tracking the progression of illness in individuals of all ages.