Its accuracy is ±0.4 C and ±2% respectively. Relative
air velocity was measured with a hot wire anemometer
(0.15–5m/s range with accuracy ±3%) and the mean
radiant temperature was measured with a globe thermometer
(Testo model 454 with a 150mm diameter
black metal ball, accuracy is ±0.41 K). The ambient air
temperature and relative humidity were also measured
using digital thermo-hygrometer. All of the tools mentioned
above were powered by batteries, and therefore
they were mobile.