Which of the following tools is primarily used for measuring temperature in HVAC applications?

In HVAC applications, measuring temperature accurately is critical for ensuring systems operate efficiently and effectively. The thermometer is the primary tool used for this purpose. It provides direct readings of temperature, which can help technicians monitor heating and cooling processes, diagnose issues, and ensure that systems are operating within the desired temperature ranges.

Other tools, while useful in HVAC, serve different purposes. For example, a manometer measures the pressure of gases, which is vital for assessing system performance but does not provide temperature information. A psychrometer measures humidity and can indirectly relate to temperature through wet bulb and dry bulb readings, but it is not used specifically to measure temperature alone. A barometer measures atmospheric pressure and is unrelated to temperature measurement. Therefore, the thermometer is the most direct and appropriate tool for measuring temperature in HVAC contexts.