Does this instrument measure river flow or water velocity? ....Google seems to think it does :)

No this meter will not work for River Flow or Water Velocity, this meter will only work with Air Flow and Air Velocity.

Does this instrument come with a nist calibration certificate?

Thank you so much for your interest in our products. Yes, the AN100 can obtain the NIST calibration certification. Be sure to order the part number AN100-NIST

what is Velocity range of this product

.4 to 30 meters/second (80 to 5906 ft/min). (From the Extech website/PDF file).

is it possible to check exhaust fan cfm ?

Yes. But you'll have to do the math. There may be conversion software in unit to go from linear feet per minute to cubic feet per minute

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Extech AN100 CFM/CMM Mini Thermo-Anemometer

Extech AN100 CFM/CMM Mini Thermo-Anemometer

Product ID: 3724718

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Details

Brand
Extech
Material
Metal
Item dimensions L x W x H
2.9 x 1.3 x 7
Item Weight
0.73 Kilograms
Screen Size
5 Centimeters

📏3.9 ft cable length for flexible reach

⚙️3% velocity accuracy with low-friction vane

🎛️Simultaneous dual display: airflow + temp

Description

🌬️ Master the air around you with precision and style!

DUAL DATA DISPLAY - Monitor air velocity and ambient temperature simultaneously on a large, easy-to-read screen—no more toggling between metrics.
PRECISION IN MOTION - Achieve ±3% velocity accuracy with a smooth 2.83-inch ball bearing vane wheel for reliable airflow readings every time.
SMART AVERAGING TECH - 20-point air flow averaging smooths out fluctuations, delivering stable and trustworthy data for critical decision-making.
MEMORY THAT WORKS FOR YOU - Set and store area dimensions effortlessly; your settings are saved for instant use on power-up, streamlining your workflow.
EXTENDED REACH MAXIMUM FLEXIBILITY - 3.9-foot cable lets you measure airflow in hard-to-reach spots without compromising accuracy or convenience.

The Extech AN100 Mini Thermo-Anemometer combines high-accuracy airflow measurement (±3%) with simultaneous temperature display on a large screen. Featuring a durable 2.83-inch ball bearing vane wheel on a 3.9-foot cable, it offers flexible, reliable readings. Its internal memory stores area dimensions for quick setup, while 20-point averaging ensures stable data. Compact and portable, it’s powered by an included AA battery and comes with a protective holster and case—ideal for professionals demanding precision and efficiency.

Specifications

Brand	Extech
Material	Plastic/Synthetic, Metal
Item dimensions L x W x H	2.9 x 1.3 x 7 inches
Item Weight	0.73 Kilograms
Screen Size	5 Centimeters
UPC	785533960648 723434088610 707223192474 793950451007
Global Trade Identification Number	00793950451007
Manufacturer	Extech
Part Number	AN100
Item Weight	1.61 pounds
Product Dimensions	2.9 x 1.3 x 7 inches
Item model number	AN100
Batteries	1 AA batteries required. (included)
Is Discontinued By Manufacturer	No
Size	CFM/CMM Thermo-Anemometer
Style	Standard
Pattern	Anemometer
Item Package Quantity	1
Number Of Pieces	1
Measurement Accuracy	+/-.5%
Included Components	Meter
Batteries Included?	Yes
Batteries Required?	Yes
Battery Cell Type	Alkaline
Warranty Description	1 year

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