Thermometer

A non-contact thermometer has an infrared sensor at the tip which detects a human body’s temperature from a distance of 5-15 cm.

How to efficiently use it?
Ideally, the temperature should be measured from a distance of 5cm with steady hands. Just point a gun-shaped infrared non-contact thermometer at the person’s forehead and press the trigger button once. The temperature will be recorded in 1 second.