Aim the thermometer's probe towards the surface to obtain a quick and accurate temperature. Based on the relationship between temperature and measurable infrared radiation, we can measure the actual body temperature by measuring the forehead surface temperature. The temperature can be measured via ear canal quickly and accurately, and it shows temperature on an easy-to-read LED screen in white light, so you can read even in the dark if you are not using the device at all. The thermometer will warn you if the reading temperature exceeds 37.5C / 99.3F. Use instruction note. The warmest after-sale services.