Abstract
We performed a parallel measurement using some commercially available WBGT measuring instruments and compared the measurement accuracy among them in summer outdoor environments. The results showed that the simple models without globe thermometer were inaccurate for measuring outdoor environmental heat stress. Therefore, use of simple models without globe thermometer is not recommended outdoors or indoors with solar radiation. Also use of a simple conversion table for WBGT values should be avoided in outdoor environments with solar radiation if the table is based on air temperature and relative humidity.
