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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Proster Digital Anemometer Handheld Wind Speed Meter CFM 5Units Backlight

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 airflow

🔋9V battery with auto power off

🌬️0.4-30 m/s wind speed range

$75.83

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Description

🌬️ Capture the breeze, master the moment!

PORTABLE POWERHOUSE - Compact, lightweight design powered by included 9V battery with low battery alert and auto shutoff for uninterrupted use.
PRECISION WIND TRACKING - Measures wind speeds from gentle breezes to strong gusts with 0.4-30 m/s range for ultimate accuracy.
CLEAR VISIBILITY ANYTIME - Large LCD with backlight lets you monitor data effortlessly, even in low-light or night conditions.
MULTI MODE FUNCTIONALITY - Hold, max, and min reading modes give you full control over your wind and airflow measurements.
VERSATILE AIRFLOW METRICS - CFM, CMM, and CMS readings up to 99990 ensure you capture every detail of air volume and flow.

The Proster Handheld Digital Anemometer is a compact, professional-grade wind speed and airflow meter featuring a wide measurement range (0.4-30 m/s), multiple airflow units (CFM, CMM, CMS), and a bright LCD backlight for easy reading in any environment. Powered by a 9V battery with auto power-off and low battery indicator, it’s designed for outdoor enthusiasts and professionals needing precise, portable wind data.

Specifications

ASIN	B01FTPX566
Additional Features	Portable
Best Sellers Rank	#206,759 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #52 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
Is Used Where	Outdoor
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)
Number of Items	1
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 Count

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$75.83

Duties & taxes included

In stock

Sold byAmazon USADelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to USA.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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Excellent communication throughout the order process. Product is perfect.

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