Overview

The Kestrel 4100 Pocket Air Flow Meter was engineered specifically with the HVAC technician’s many needs in mind. In addition to measuring volume air flow, this multi-functional precision instrument also measures temperature, relative humidity and dewpoint, either ambient or in any accessible airflow.

Tired of cumbersome equations to calculate the CFM? The 4100 makes it possible to determine CFM without using a calculator. For immediate and accurate air flow readings, simply enter the duct shape and dimensions, hold the 4100 in the air flow and the volume air flow readings are displayed... no calculator required! The convenient averaging mode ensures accurate CFM readings in any airflow or duct size and shape.

The Kestrel 4100 air flow meter features a powerful data logger that records 2000 sets of measurements at user-selectable time intervals (over 2 years of data can be recorded). Logged data can be reviewed with the 4100’s on-screen graphing capabilities, or uploaded to a PC for in-depth review. The optional Kestrel Interface and accompanying Kestrel Communicator software makes long-term storage, in-depth analysis and detailed charting of stored data a breeze.

With on-screen customization, the 4100 can truly be personalized for every technician. Easy set-up screens allow the unit to display only relevant readings, and hide screens not relative to the job. Plus the Kestrel’s User Screens group pertinent information on one easily referenced screen.

Don’t let the inexpensive price tag fool you — the Kestrel 4100 is as accurate as instruments costing far more. Every Kestrel is individually calibrated to NIST-traceable standards and comes with a free Certificate of Conformity. (Individual NIST certificates and recalibration are also available.) Consider the 4100’s hold and averaging functions, and it’s the only instrument HVAC technicians need to perform a variety of jobs.

This all-in-one instrument is so comprehensive, accurate and innovative that it won the ACHR News Dealer Design Award for excellence in product design. "Every technician I employ will have one of these units ASAP!" said one of the Dealer Design judges.

The Kestrel 4100 Air Flow Meter is an affordable tool that is easy to carry and use, and is ideal for facilities managers, HVAC equipment sales people, home inspectors, dehumidification specialists, field installers and technicians.

Kestrel 4100 Measures

• Current, average, and maximum air velocity


• Volume air flow in cfm, L/s, m³/s, m³/m, m³/h


• Air Velocity in ft/m, mph, m/s, km/h, kts, Beaufort


• Temperature in °F or °C


• Relative humidity in %


• Heat stress index


• Dewpoint

Kestrel 4100 Features

• Waterproof and floats


• Backlit display for low light conditions


• Multi-Function 3-line display


• Humidity sensor can be recalibrated in the field with our Relative Humidity Calibration Kit.


• Automatic and manual data storage


• Customizable data storage - 2000 data points


• Data charting


• Data upload (with optional interface)


• Minimum, maximum, and average values


• Five languages (English, French, Spanish, German, and Italian)


• User-replaceable impeller


• Flip-top impeller cover


• US Patent Nos. 5,783,753 and 5,939,645 and 6,257,074


• All instruments and accessories are completely assembled in the USA


• 5-year warranty

Kestrel 4100 Includes

• Soft carry pouch


• Wrist and neck lanyards


• Batteries - 2 AAA


• Kestrel Certificate of Conformity