1This thermometer is based on R.A.T.E™ (Rapid, Accurate, Temperature,Establishment) technology. The accurate measurement is obtained byusing a unique probe, which measures the heat flow from the bloodvessels to the skin and converts it to body temperature.How Does it Work?What is “normal” body temperature? “Normal” body temperaturevaries from person to person and changes according to time of day andbody location. Hot or cold baths, physical exercise, smoking anddrinking hot or cold drinks may change body temperature by one degreeor more.The following table shows the temperature ranges:Body TemperatureWhat is fever? Average normal temperature rangesForehead Over 100.0°F / 37.8°C 97.0°F - 100.0°F / 36.1°C – 37.8°CRectal* Over 100.4°F / 38°C 97.3°F - 100.4°F / 36.3°C – 38°COral * Over 100.0°F / 37.8°C 97.0°F - 100.0°F / 36.1°C – 37.8°CUnderarm* Over 99.0°F / 37.2°C 95.4°F - 99.0°F / 35.2°C – 37.2°C* Fever definitions according to the American Medical AssociationThe thermometer is designed to precisely measure the temperatureof the forehead between the eye socket and the hairline. It isimportant to know that the thermal characteristics of eachmeasurement body location (temple, underarm, oral or rectal) areunique. The variance in temperature measurement in differentbloodvessels skin thermometerheattransfervasossanguíneospiel termómetrotransferenciade calorThermometerSkinHeatTransferBloodVessels