Measures core temperature instantly from the ear reliably and accurately. Range 89.6°F-108°F ± .4°F or 32°C-42.2°C ± .2°C depending on scale selection. Large 6mm illuminated display is easy to read. Compact (5-inch Long, 1.9 oz.) ergonomic design fits comfortably in operator's hand and patient's ear. Audible fever alarm at 99.5°F (37.5°C). 12 reading memory. Complete with lithium battery, storage/travel case, and operating instructions. Meets ASTM E1965-98 standards for accuracy.