Wet Bulb Globe Heat Stress MeterThe Wet Bulb Globe Heat Stress Meter is a lightweight meter that's compact enough to carry anywhere. WBGT Temperature Air Temperature Relative Humidity Globe Temperature OSHA and other government organization have set recommended heat stress limits for various activities. WBGT (Wet Bulb Globe Temperature) provides the most accurate determination of the heat stress index based on the cumulative effect of air temperature, air movement, relative