The Kestrel 4200 measures relative humidity and calculates dewpoint, wet bulb temperature, heat stress index, and the humidity ratio—and the patented dual chamber humidity sensor assures fast and accurate readings in any environment.

The Kestrel 4200 has taken the calculations and guess-work out of air flow measurements with automatic air flow readings. Plus, it measures every other environmental parameter and stores over two years worth of information in its built-in data logger. And with on-screen customization, the 4200 can truly be personalized for every technician.

Kestrel 4200 Measures
• Humidity ratio
• Relative humidity
• Current air velocity
• Average air velocity
• Max air velocity
• Air flow
• Temperature
• Barometric pressure
• Dewpoint
• Wet bulb temp
• Altitude
• Heat stress index
• Density altitude
• Wind chill

Kestrel 4200 Features
• Waterproof & floats
• Automatic & manual data storage
• Data upload with optional interface
• Customizable data storage
• Minimum, maximum & average values
• Backlit display
• Data charting
• Five languages: English, French, Spanish, German & Italian
• User replaceable impeller
• Flip-top impeller cover
• Made in the USA
• 5-year warranty
• Includes soft carry pouch, wrist & neck lanyards, and 2 AAA batteries