The Triplett HS10 heat stress WBGT (Wet Bulb Globe Temperature) compact meter monitors indoor/outdoor heat index to help limit the danger of heat-related injury. It simultaneously displays air temperature, humidity, and Wet Bulb Globe Temperature (WBGT), or heat index, updating every 20 seconds. It features programmable audible and visual WBGT and heat index alarms with an adjustable audible alarm volume (75dB/60dB/mute) and 4 indicators, which displays heat stress alert levels (caution, extreme caution, danger, extreme danger). An In/Out function switch measures WBGT with or without the effects of direct sunlight. The HS10 is °F/°C switchable and comes with a wall mount for permanent installation, as well as a tripod mount, which can be used to free up hands when taking measurements over extended periods of time. The applications of the heat index can be in construction, iron and steel foundries, bricks-firing plants, glass facilities, boiler rooms, mining sites, army training, marathon, beach activities and so on.