Which equipment is commonly used to measure the temperature of refrigerants?

The correct answer is centered on the use of thermocouples and pressure-temperature charts, which are essential tools for accurately measuring the temperature of refrigerants. Thermocouples are widely utilized in refrigeration applications because they consist of two different metals that generate a voltage in response to temperature differences, allowing for precise temperature readings over a range of conditions.

Pressure-temperature charts provide a vital reference that relates the pressure of the refrigerant in a system to its corresponding temperature. This is particularly important in refrigeration systems, as the relationship between pressure and temperature is crucial for proper system diagnostics, maintenance, and efficiency calculations.

By employing these tools, a technician can ensure that refrigerant temperatures are within optimal operating ranges, which is critical for the efficiency and longevity of refrigeration systems. Other options listed, while relevant in different contexts, do not play the same direct role in measuring refrigerant temperature.