How is dry bulb temperature measured?

Dry bulb temperature is measured using a standard thermometer, which is designed to provide the temperature of the air without considering moisture content. This type of thermometer can be either a digital or analog device and is typically placed in the air being measured. The reading it provides is simply the air temperature, expressed in degrees Fahrenheit or Celsius.

The other instruments mentioned serve different purposes. A psychrometer is used for measuring both dry bulb and wet bulb temperatures, which are important for calculating humidity. A hygrometer specifically measures humidity levels and does not provide a direct measurement of dry bulb temperature. A manometer measures pressure in fluids and is not applicable to temperature measurement. Thus, the correct answer hinges on the fundamental definition of how dry bulb temperature is defined and measured.