Easy to use Tympanic thermometer measures core temperature instantly. Convenient, economical probe covers make it the ideal instrument for use on all types of patients. The Adtemp 424 features: 1 second measurement using scan/peak technology. Large 6mm illuminated display. Multiple Use (wide range 89.6°F - 108°F +/- .4°F(32°C - 42.2°C +/- .2°C). °F/°C switchable display. Fever alarm at 99.5°F (37.5°C). Last reading memory. Audible beep when measurement is complete. Auto off conserves battery life. Compact design - 5 1/2 (13.97cm) long, weighs 1.6oz. (45.3g) including battery. Powered by 1.55v (CR2032) Lithium battery (included). Includes 20 probe covers in convenient dispenser. Desktop storage caddy. Meets ASTM E1965-98 standards for accuracy.