Measure individual sweat loss across a working shift.

Heat strokeof mine rescue deaths.
Heat illnessof underground crews.
Open cut crewsover the ISO core temperature limit.
Sources · Front Public Health · Annals of Global Health
Miner by miner.
Not who looks tired.
Water, rest, rotation.
days of graded exposure MSHA recommends before full shifts in hot workings.
of heat deaths came on days rated only moderate risk.
SOURCES: MSHA · MARICOPA COUNTY DPH · EPA
Forearm, arm or lower back.
Enter the furthest channel reached.
Fluid loss and sweat rate, per person.
Worn under PPE
Sweat only, no blood or urine
Sweat rate, fluid loss, sodium and potassium
One shift per patch, then discarded
3M adhesive, ISO biocompatible
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