The technology used to measure the temperature of the body is called a thermometer. Thermometers come in several types, including digital, infrared, and traditional mercury thermometers. Digital thermometers provide quick and accurate readings and are often used orally, rectally, or under the armpit. Infrared thermometers measure temperature without contact, making them ideal for quick assessments, especially during health screenings. Traditional mercury thermometers are less common today due to safety concerns, as they can break and release mercury. Regardless of the type, thermometers are essential tools in both medical settings and home care.