What type of thermometer is a magnetic surface contact thermometer?

A magnetic surface contact thermometer is classified as a contact thermometer because it is designed to measure the temperature of a surface directly by being in contact with it. This type of thermometer uses a probe that affixes magnetically to the surface being surveyed, allowing it to capture the temperature accurately at that specific point.

Contact thermometers are characterized by their ability to provide accurate readings based on physical contact with the object whose temperature is being measured, which is the essential function of a magnetic surface contact thermometer.

In contrast, the other options do not accurately define the nature of a magnetic surface contact thermometer. A humidity meter focuses on moisture levels rather than temperature, a liquid-in-glass thermometer typically contains a liquid that expands within a glass tube and is not reliant on magnetic contact with a surface, and a digital thermometer may or may not have contact-based measurement techniques but does not specifically refer to magnetic surfaces. Therefore, classifying a magnetic surface contact thermometer as a contact thermometer appropriately describes its operational principles and use in temperature measurement.