Non-contact MeasuringNon-contact infrared technology reads from forehead with no physical contact, prevents cross-infection between multiple peoples.The measurement range is 3-5cm. RAPID INSTANT READING- Forehead thermometer adult non contact temperature readings. 1000 reading memory storage. Great for workplace or school screenings. Infrared Thermometer Precision Probe : Our Forehead Thermometer is adopting the latest infrared scanning technology, and hold it 1-3 CM away and press the purple trigger to take the reading.When the battery power is low, low power symbol will appear on the display, prompting to replace new battery (2x AAA batteries Included )Intelligent Fever AlarmThe fever thermometer has a three-color backlight color alarm function. If the temperature is below 99.1 F / 37.3 C, the LCD will display green (normal body temperature). If the temperature is between 99.3 F / 37.4 C ~ 100.2 F / 37.9 C, the LCD will display orange (low fever). If the temperature exceeds 100.4 F / 38 C, the LCD will display red (high fever).