A thermometer is a device that measures temperature or a temperature gradient.
In electronics industry various types of thermometers are used. Some types of thermometers like a pyrometer can measure temperature on a surface remotely. Thermometers can be handheld, benchtop or wall mounted. Handheld thermometers can be dust and/or waterproof safe. Thermometers are equipped with different types of displays. Often thermometers are also able to measure humidity.