Digital thermometers are used in many industries that need to measure and monitor temperature like the food prep industry, laboratories, manufacturing and scientific testing. Because digital thermometers have long thin probes, they’re perfect for measuring liquids. The infrared thermometer, on the other hand, can measure temperature from a distance without ever touching the the item you are measuring. There are analog thermometers that are used to measure the temperature outside or in, and thermometers that measure the temperature of the human body. When measuring the temperature of the human body, choose forehead thermometers, ear thermometers or the standard oral or rectal thermometers.