Citizen CT422 is a digital thermometer designed to accurately measure human body temperature. It features a peak hold function to capture the highest temperature reached during measurement. The device can be used for oral or underarm measurements, with readings displayed in Celsius. It has a clear LCD screen for easy viewing of results and a battery level indicator. The thermometer automatically turns off after 16 minutes of inactivity to conserve battery life. It also includes a memory function to store and recall the last temperature reading.