Kata thermometer measures
Kata thermometer measures ‘cooling power of air’: Cooling power of air comprises of

– Air temperature
– Humidity
– Air movement

Kata thermometer readings as indices of thermal comfort:

– Dry kata reading > 6 (Thermal comfort)
– Wet kata reading > 20 (Thermal comfort)

Nowadays it is used to record low air velocity.
Air temperature only
Air temperature, humidity and air movement
Air temperature and humidity
Air velocity only