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Environmental monitors designed to continuously detect and measure multiple environmental parameters and to calculate and display heat stress indices calculated from these parameters. Environmental heat stress monitors typically include apparatus to measure parameters related to temperature, relative humidity, water vapor pressure, and/or wind velocity. These parameters, including dry bulb temperature, wet bulb temperature, globe temperature, and/or wind speed are used to calculate one or more heat stress indices such as the wet bulb globe temperature (WBGT) or thermal work limit (TWL). Environmental heat stress monitors are typically used as an aid in managing the amount of time personnel spend working in potentially hazardous warm and/or humid environments.
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