Answer : "Hygrometers and Hair Thermometer".
Explanation :
Barometer: It is used to find or calculate the atmospheric pressure of any region. It is also used to review the weather patterns.
Hygrometers: It is an instrument that is used to calculate the humidity amount and the water vapors in the surrounding.
Anemometer: It is a device which is used to find the speed of wind in a particular region.
Hair Thermometer: It is also used to measure the humidity level in a region.
So, the correct options are (2) and (4) i.e. "Hygrometers and Hair Thermometer".