Thermometer & body tester - thermometer is one of thermograph, to sense objects' surface temperature by infrared ray. It is quite easy to operate. Here what we are recommending is the 4-in-1 forehead and ear thermometer. It is mainly used to measure your forehead and ear temperature. With cr2023 battery included, it can last for a long time. The operating condition is about 5 "ƒ~40 "ƒ(41 "‰~104 "‰). As long as you use it according to the instruction, it will serve you of long standing. Do not hesitate, chance is before you! features can easily sense the surface temperatureit is easy to operatemainly used to measure your forehead and ear temperaturemade of high quality material, it is quite durablegive you approximate figure of thermometerspecifications colorwhite & cyanmeasurementrange : 0 "ƒ-100 "‰ (32 "‰~212 "‰)measurement resolution0.1 "ƒ(0.2 "‰)green backlightnormal temperature 32 "ƒ~37.3 "ƒ/89.6 "‰~99.1 "‰ yellow backlightslight fever(alarm point) 37.4 "ƒ~38 "ƒ/99.3~100.4 "‰ red backlighthight fever 38.1 "ƒ~42.9 "ƒ/100.6 "‰-109.2 "‰ batterycr2023 includedoperating condition5 "ƒ~40 "ƒ(41 "‰~104 "‰), rh ‰¤85%storage condition-20 "ƒ~70 "ƒ(-4 "‰~158 "‰), rh ‰¤85%dimensions4.61 x 1.38" / 11.7 x 3.5cm (lxw)weight2.92 oz / 83 gpackage includes 1 x 4-in-1 forehead and ear thermometer .