Which tool is commonly used to measure the temperature of fluids in an exchanger?

A thermometer is a device specifically designed to measure the temperature of various substances, including fluids in heat exchangers. In the context of a heat exchanger, maintaining the correct temperature is crucial for optimal operation and ensuring the efficiency of energy transfer.

Thermometers come in various types, such as digital, infrared, and mercury, each suitable for different applications. Their primary role in this setting is to provide accurate readings that help monitor performance and detect any deviations that could indicate problems, such as overheating or inefficiencies.

The other tools mentioned serve different purposes. A caliper is used for measuring dimensions and tolerances of physical objects, while a bore gauge measures the diameter of holes. A flow meter measures the flow rate of a fluid but does not provide temperature readings. Thus, for temperature measurement in heat exchangers, a thermometer is the appropriate tool.