Kestrel 4200 Air Flow & Environmental Meter

by Kestrel
Sold out
$349.00 USD
$259.00 USD
The product is out of stock

This item has been discontinued and replaced by the Kestrel 5200 Professional Meter. Click here for the Kestrel 5200.


Take the calculations and guess-work out of air flow measurements with automatic air flow readings.

Kestrel 4200 (0842) & 4200 with Bluetooth (0842B) Air Flow & Environmental Meter Overview

The Kestrel 4200 makes HVAC technicians jobs even easier with automatic wet bulb temperature and humidity ratio readings. Of particular interest to Kestrel 4200 being used by a HVAC professionaldehumidification professionals, the Kestrel 4200 measures relative humidity, dewpoint, wet bulb temperature and heat stress index as well as the humidity ratio—and the patented dual chamber humidity sensor assures fast and accurate readings in any environment. Get immediate and accurate readings of volume air flow, wet bulb temperature and humidity ratio. Enter the duct shape and dimensions, hold the Kestrel in the air flow and the volume air flow readings are displayed right on the screen.

The Kestrel 4200 HVAC Air Flow Meter & Environmental Meter features a powerful data logger that records 1600 sets of measurements at user-selectable time intervals (over 2 years of data can be recorded). Logged data can be reviewed with the 4200’s on-screen graphing capabilities, or uploaded to a PC for in-depth review. The optional Kestrel Interface and accompanying Kestrel Communicator Kestrel 4200 displaying temperature datasoftware makes long-term storage, in-depth analysis and detailed charting of stored data a breeze. With on-screen customization, the 4200 can truly be personalized for every technician. Easy set-up screens allow the unit to display only relevant readings, and hide screens not related to the job. Plus the Kestrel’s user screens group pertinent information on one easily referenced screen.

Includes: Soft Carry Pouch, Neck Lanyard, 2 AAA Batteries (average life 400 hours) and Kestrel Certificate of Conformity.



  • Air Flow (CFM)
  • Air Velocity
  • Altitude
  • Barometric Pressure
  • Density Altitude
  • Dew Point
  • Heat Stress Index
  • Humidity Ratio
  • Temperature
  • Wet Bulb Temperature (Psychrometric)
  • Wind Chill
  • Wind Speed

Who's Using the Kestrel 4200 Air Flow & Environmental Meter

  • Facilities Management
  • Industrial Hygiene
  • Military
  • Wind Surfing


  • 2 AAA Lithium Batteries (Average Life 400 Hours)
  • 5 Languages (English, French, Spanish, German, Italian)
  • Backlight
  • Carry Pouch
  • Clock & Calendar
  • Customizable Data Storage
  • Data Logger
  • Data Upload (With Optional Interface)
  • Drop-Tested, MIL-STD-810F
  • Easy-To-Read Display
  • Flip-Open Impeller Cover
  • Graph & Recall Trends
  • Kestrel Certificate of Conformity
  • Lightweight & Durable
  • Minimum and Maximum Values
  • Neck Lanyard
  • Patented Impeller and Sensor Technology
  • User-Replaceable Batteries
  • User-Replaceable Impeller
Kestrel Weather & Environmental Meters areKestrel Pocket Weather Meters are Made in the USA designed & manufactured in the U.S.A and are backed by a 5-year Manufacturer's warranty. Innovatively designed for stability and accuracy in abrupt condition changes. Rugged and durable, Kestrels are drop tested, waterproof and designed to float if dropped in water.
Kestrel 4200 Manual
Kestrel 4200 Specifications