Does it measure wind? Why do they stop at 69mph

Yes it does.my went up to 98mph in tn

Does this have a function to show average wind speed?

This model does not show average wind speed.

Anyone know how to calculate cfm’s in 4 inch round duct using this device?

You could make a 'funnel' to force all of the air flow through the anemometer blades, and just read the CFM's. Probably OK for a strong air source. Otherwise, measure the air flow in feet per minute and multiply by the area of the 4" duct in square feet. The formula is Area=pi x r squared. Sorry, I do not have a math typeface handy. Remember the area must be in square feet. Just to clarify, for a 4 inch duct, the area= 3.14 x (2/12) x (2/12) = 0.087 square feet. Multiply that by the air flow and you have CFM.

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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Proster Handheld Digital Anemometer - Portable Wind Speed Meter CFM Meter Wind Gauge Air Volume Measure with LCD Backlight for Outdoors Sailing Surfing Fishing

Product ID: 32322430

Details

Brand
Proster
Color
Anemometer
Material
Plastic
Number of Batteries
1 9V batteries
Power Source
Battery
Product Dimensions
1.49"D x x

📊CFM up to 99990 for precise air volume

🔋9V battery with low power alert

🌬️0.4-30 m/s wind speed range

AED 200

Duties & taxes included

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Description

🌟 Own the wind, master the moment — Proster Anemometer keeps you ahead of the breeze!

LONG LASTING POWER - Includes 9V battery with auto power-off and low battery indicator to keep you measuring without interruption.
MULTI UNIT MASTERY - Seamlessly switch between m/s, km/h, mph, knots, and CFM for versatile pro-level readings.
NIGHT READY DISPLAY - Large backlit LCD ensures crystal-clear data visibility even in low-light or night conditions.
ERGONOMIC PORTABLE - Compact, lightweight design with rubber grip fits perfectly in your hand or jacket pocket—ready for any adventure.
PRECISION WIND METRICS - Capture every breeze with ultra-sensitive 0.4 to 30 m/s range for flawless outdoor decisions.

The Proster Handheld Digital Anemometer is a professional-grade, portable wind speed and air volume meter featuring a wide measurement range (0.4-30 m/s), multi-unit display options, and a large backlit LCD for easy reading in all conditions. Powered by an included 9V battery with low battery alert and auto shutoff, its ergonomic design and durable build make it an essential tool for outdoor enthusiasts, sailors, surfers, drone pilots, and professionals who demand precise wind data on the go.

Specifications

ASIN	B01FTPX566
Additional Features	Portable
Are batteries included?	Yes
Best Sellers Rank	#78,956 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #20 in Wind Speed Gauges
Brand Name	Proster
Color	Anemometer
Customer Reviews	4.4 4.4 out of 5 stars (803)
Display Type	LCD
Included Components	Battery
Item Dimensions D x W x H	1.49"D x 3.35"W x 6.49"H
Item Type Name	WIND
Item Weight	11.3 Ounces
Manufacturer	Proster Trading Limited
Material Type	Plastic
Model	WIND
Number of Batteries	1 9V batteries required. (included)
Part Number	PSTTL145US
Power Source	Battery Powered
Recommended Uses For Product	Outdoor
Sensor Technology	Mechanical
Shape	Oval
Specific Uses For Product	Wind Speed
Style Name	Compact
UPC	753807579186
Unit Count	1.0 Count

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