The most compact tympanic thermometer on the market, the Adtemp 421 Thermometer features a 12 reading memory. The instant and most accurate temparature measurement ranges from 89.6°F-108°F - .4°F or 32°C-42.2°C - .2°C. With the large 6mm illuminated display, readings are easy to the eyes. Its ergonomic design provides a comfortable fit both in the operator's hand, and in the patient's ear. A lithiium battery, storage case, and operating instructions complete the Adtemp Tympanic Digital Ear Thermometer as the go-to thermometer for personal and professional use.