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

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 99,990 for precise airflow

🔋9V battery included with auto power-off

🌬️0.4-30 m/s wind speed range

Description

🌬️ Master the breeze, wherever you go!

PORTABLE READY TO GO - Compact, lightweight design powered by included 9V battery—perfect for on-the-move pros.
PRECISION WIND METRICS - Track wind speeds from gentle breezes to strong gusts with ultra-accurate multi-unit readings.
SMART POWER MANAGEMENT - Low battery indicator and auto shut-off extend device life so you never miss a critical reading.
ALL CONDITION VISIBILITY - Large LCD with backlight ensures clear data reading anytime, even in low-light outdoor adventures.
VERSATILE AIRFLOW MEASUREMENT - Measure CFM, CMM, and CMS with a wide range for professional-grade air volume analysis.

The Proster Handheld Digital Anemometer is a compact, professional-grade wind speed and air volume meter featuring a broad measurement range (0.4-30 m/s), multi-unit airflow metrics (CFM, CMM, CMS), and a large backlit LCD for easy outdoor use. Powered by an included 9V battery with smart power-saving features, it’s designed for precision and portability in sailing, surfing, fishing, and other outdoor activities.

Specifications

ASIN	B01FTPX566
Additional Features	Portable
Best Sellers Rank	#343,495 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #92 in Wind Speed Gauges
Brand Name	Proster
Color	Anemometer
Customer Reviews	4.4 4.4 out of 5 stars (804)
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)
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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