how thermometer measure temperature

Non-Contact Digital Thermometer - With clinical validation and medical certification, our forehead thermometer can be trusted for accuracy, safety and easy-to-use. The thermometer, small but handy, is dedicated to providing accurate body temperature and the best care for your family.
Dual Mode & Memory Mode - Hold this smart infrared thermometer close to your forehead and press the button is forehead mode. it can store up to 20 sets of data, you can read the temperature record at any time to track your historical temperature changes.
Fast & Accurate - With precise sensor probes and optimized algorithm calculation, the infrared thermometer gives the result of the measurement data within 1 second at most. The clear large LCD screen display, it allows you easy to read day and night.
What You Get - 1 x Touchless Infrared Thermometer, 1 x User Manual, You will also get 12 months replacement from the date of purchase and 24-7 friendly customer service!