Which instrument is used to measure wet bulb and dry bulb temperatures?

A sling psychrometer is the correct choice for measuring both wet bulb and dry bulb temperatures. This instrument consists of two thermometers: one with a dry bulb that measures the air temperature and another with a wet bulb, which has a moist wick around its bulb and measures the temperature influenced by the evaporation of water.

When using a sling psychrometer, the device is swung around to allow air to flow over the thermometers, which helps to accurately read the temperatures. The difference between the wet bulb and dry bulb temperatures is crucial for calculating humidity and evaluating the moisture content in the air, which is important in various applications including HVAC systems.

An anemometer is specifically designed to measure wind speed and does not provide temperature readings. A psychometric chart is a tool used in conjunction with psychrometric data but does not measure any temperatures directly. A thermocouple is an instrument for measuring temperature, but it does not differentiate between wet and dry bulb measurements. Thus, the sling psychrometer is uniquely suited for this dual-temperature measurement task.