Which device is used to measure refrigerant temperature during service?

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Measuring temperature requires a device that directly senses temperature, and a thermometer does exactly that. It provides a direct reading of the refrigerant’s temperature during service, which is essential for tasks like checking superheat and subcooling and ensuring proper charge. The other tools have different purposes: a pressure gauge measures pressure (not temperature), an anemometer measures air flow, and a hygrometer measures humidity. So a thermometer is the appropriate instrument for determining refrigerant temperature.