Xtreme Research Corporation manufactures a Heat Index Monitoring System
that functions to alert the user during conditions of excessive heat and humidity.
The human body normally cools itself by perspiration, but when relative humidity
reduces the evaporation rate because of high humidity, the result is a lower rate
of heat removal from the body, the sense of being overheated, heat stress
or heat stroke. The SkyScan Ti-Plus 2 shows all ranges of dangerous
heat conditions and sounds an audible warning before heat index reaches
critical levels.

SkyScan Ti-Plus 2