Kestrel 3500-IS Intrinsically Safe Air Weather Meter

The Kestrel 3500-IS Intrinsically Safe Weather Meter is a critical piece of equipment in underground mine ventilation operations. The 3500-IS is a lightweight, reliable and suitably certified tool for monitoring air velocity and weather in underground environments for managing and monitoring a safe environment and heat stress for underground workers.

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The Kestrel 3500-IS Intrinsically Safe Pocket Weather Meter is a critical instrument for use in underground mine ventilation operations. Split-second decisions in the field leave no time for guesswork. Get every environmental condition in seconds with the reliable Kestrel 3500-IS. A rugged, multi-function wind and weather meter that measures all the environmental variables,
including air velocity (wind speed), wet/dry bulb temperature, relative humidity, heat stress index, barometric pressure, dew point and more. Every unit is fully tested for measurement accuracy and waterproof integrity and is calibrated to NIST traceable standards.

Intrinsic Safety

The Kestrel Model 3500-IS Intrinsically Safe Pocket Weather Meter holds a Certificate of Conformity for Explosion-Protected Electrical Equipment
(to Ex ia I IP55) issued by SIMTARS.


  • 3-Button Control
  • Real-time Clock
  • Drop-Tested, MIL-STD-810G
  • Waterproof and Floats
  • Easy-to-read display with backlight
  • Data hold function
  • CR2032 Coin Cell Battery (Average Life 300 Hours)
  • Neck Lanyard
  • Forecast weather with pressure trend indicator
  • Patented Impeller and Sensor Technology
  • Reliable, portable and easy to use
  • Slip-On Protective Cover


  • Current/Average Wind Speed
  • Maximum Wind Gust
  • Wet/Dry Bulb Temperature
  • Relative Humidity
  • Heat Stress Index
  • Wind Chill
  • Dew Point
  • Barometric Pressure
  • Pressure Trend
  • Altitude

Kestrel 3500-IS Specifications


Sensor Accuracy Resolution Spec. Range
Wind Speed / Air Speed Larger of 3% of reading, least significant digit or 20 ft/min 0.1   m/s

1 ft/min

0.1 km/h

0.1 mph

0.1 knots

1 B

0.6 to 40.0 m/s

118 to 7,874 ft/min 2.2 to 144.0 km/h

1.3 to 89.5 mph

1.2 to 77.8 knots

0 to 12 B

Ambient Temperature 0.5 °C 0.1 °C -29.0 to 70.0 °C
Relative Humidity 3% RH 0.1% RH 5 to 95% 25°C non-condensing
Pressure 1.5 hPa|mbar

0.044 inHg

0.022 PSI

0.1 hPa|mbar

0.01 inHg

0.01 PSI

750-1100 hPa|mbar 22.15-32.48 inHg 10.88-15.95 PSI

Calculated Measurements 

Measurement Accuracy Resolution Sensors Employed
Altitude typical: 23.6ft/7.2 m from 750 to 1100 mBar

max: 48.2 ft/14.7 m from 300 to 750 mBar



Pressure, User Input (Reference Pressure)
Barometric Pressure 0.07 inHg

2.4 hPa|mbar

0.03 PSI

0.01 inHg

0.1 hPa|mbar

0.01 psi pressure

Pressure, User Input (Reference Altitude)
Delta-T 3.2 °F

1.8 °C

0.1 °C Temp, RH, Pressure
Dew Point 3.4 °F

1.9 °C

15-95% RH

Refer to Range for Temperature Sensor

0.1 °C Temp, RH
Heat Index 4.0°C 0.1 °C Temp, RH
Wet Bulb Temp.


1.8 °C 0.1 °C Temp, RH, Pressure
Wind Chill 0.9 °C 0.1 °C Wind Speed, Temperature


Additional information

Additional Info

Model No: KAU-KES-3500-ISThe Kestrel 3500 handheld meter was designed with the same simplicity of the Kestrel 1000 in mind, but with the ability to do much more advanced tas

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