HydroSense Innovosens

For U.S. Fire Departments

Heat strain takes the one who looked fine at roll call.

Measure individual sweat loss during departmental training.

Backed By Sony, EU Seal of Excellence

Firefighters attending a downed colleague in a burned corridor

Recognized By European Innovation Programs.

Horizon 2020 EU Research &
Innovation

The Risk That Takes Your People Is The One Nobody Can See.

Fire crew in full turnout gear at the apparatus bay

Line of dutyfirefighter deaths in 2025.

45%

Leading causefrom overexertion or strain.

90%

Peak exertionof maximum heart rate.

Sources · NFPA · U.S. Fire Administration

HydroSense patch worn on a forearm during a training evolution

Measure the strain

Firefighter by firefighter.

The HydroSense app showing a session sweat-loss reading

Name who is at risk

Not who looks tired.

Act before a mayday

Rehab, fluids, fresh crew.

Where The Heat Season Runs Longest.

APR

MAY

JUN

JUL

AUG

SEP

OCT

Phoenix & the Sonoran Desert

Permian Basin & Texas Gulf

California Central Valley

Florida & the Gulf Southeast

Nevada & the Mojave

Interior fire attack, all year

Heat risk Low Elevated High Extreme

430

heat deaths in Maricopa County, AZ in 2025, up from 84 in 2015.

47%

of those deaths came on days rated only moderate risk.

SOURCES: MARICOPA COUNTY DPH · BLS · EPA · NFPA

Close-up of the numbered sweat patch worn on a forearm

The HydroSense app showing a session sweat-loss reading, with the patch worn on the forearm

A phone showing the session summary next to a HydroSense two-pack and a sweat patch

One Patch. One Photo.

Apply

Forearm, arm or lower back.

Photograph

Enter the furthest channel reached.

Read

Fluid loss and sweat rate, per person.

Product safety

Single Use Sweat Patch.

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

Every Session Ends With A Name.

Sample report · 45 min stair climb

fl oz

CREW AVG 48

FF-04

69 oz

FF-02

55 oz

FF-05

45 oz

FF-01

40 oz

FF-03

30 oz

ground the crew that is not ready

Awards & Grants

European Commission Seal of Excellence — EU Commission Seal of Excellence 2020

A firefighter in full turnout gear and SCBA climbing a stairwell during a training evolution

In Pilot With The Seattle Fire Department.

Seattle Fire Department Pilot partner

What Safety Leads Ask First.

HydroSense on KickstarterView campaign

Start With One Crew.

First name

Last name

Work email

Organization

Phone (optional, include country code)What is your primary role within your department or agency?How many active personnel operate within your department or crew?What is your department's target timeline for deploying biomarker and heat-stress monitoring?

Book directly

Thanks, {{ first }}.

Pick a time that suits you.

Proceed to schedule a meeting

See what your crews are losing

Book a 10 minute call