Measure individual sweat loss during demanding site work.

Heat deathsof the U.S. workplace total.
First weekof heat deaths on the job happen then.
Phoenixdays a year above 100 °F.
Sources · BLS · OSHA · NOAA
Worker by worker.
Not who looks tired.
Shade, water, rotation.
heat deaths in Maricopa County, AZ in 2025, up from 84 in 2015.
of those deaths came on days rated only moderate risk.
SOURCES: MARICOPA COUNTY DPH · BLS · EPA · NFPA
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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