For the home or workplace, the portable Non-contact body infrared thermometer is designed to read body temperature filtering ambient temperature. It is recommended for thermometer to be calibrated in the operating environment for 15-20 minutes prior to use for better accuracy. Features:Non-contact body infrared thermometer is specially designed to take the body temperature of a person, regardless of room temperature. - Depending on various skin types and thickness, there may be temperature difference. - When the indoor temperature is significantly different, the body infrared thermometer should be placed in that room for 15-20 minutes before using. - Specifications:Temperature measurement range 35 - 42.9 Temperature measurement accuracy: 0.3(0.54F)The reaction time: 0.5 seconds - Measuring distance: 3-10 cm - Automatic shutdown time: about 10 seconds - Display accuracy: 0.1 (0.1 )The operating environment temperature: 10-40Relative humidity: < 85%Product size: 17 X 9 X 5cm - Net weight: 160 g (battery is not included)Battery: 2*1.5 V AAA battery (battery is not included)