To measure body temperature, for example, a thermal contrast film is used - it is enough to stick it on the body and at high temperatures it changes its color, it has 2a modes "normal" and "fever". There are laser thermometers, they are contactless. The device is directed towards the patient and the body temperature is displayed on the screen
You can also measure the temperature of a person's body with a non-contact thermometer, such as this: https://adapteroff.ru/products/beskontaktnyj-infrakrasnyj-termometr-dt-8836
This model is a medical thermometer, which is confirmed by the presence of the Registration Certificate. However, they are available.