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.

Proster Handheld Digital Anemometer Portable Wind Speed Meter Cfm Meter

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

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R1369

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Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🌟 Catch the breeze, own the moment with Proster’s precision wind gauge!

POWER THAT LASTS - Includes a 9V battery with low battery alert and auto power-off to keep you measuring longer without interruptions.
NIGHT READY DISPLAY - Large, backlit LCD ensures crystal-clear readings even in low-light or nighttime conditions—never miss a beat.
ERGONOMIC PORTABLE - Compact, lightweight design with a rubber grip fits perfectly in your hand or gear bag for on-the-go convenience.
PRECISION WIND MASTERY - Accurately measures wind speeds from a gentle breeze to strong gusts (0.4-30 m/s) for confident outdoor decisions.
VERSATILE AIRFLOW METRICS - Switch seamlessly between CFM, CMM, and CMS units to quantify air volume with professional-grade precision.

The Proster Handheld Digital Anemometer is a compact, professional-grade wind speed meter offering a wide measurement range (0.4-30 m/s) and multi-unit airflow readings (CFM, CMM, CMS). Featuring a large backlit LCD for easy visibility in any light, it’s powered by an included 9V battery with smart power-saving features. Designed for outdoor enthusiasts and professionals alike, its ergonomic build and reliable accuracy make it an essential tool for sailing, surfing, fishing, drone flying, and more.

Specifications

ASIN	B01FTPX566
Additional Features	Portable
Are batteries included?	Yes
Best Sellers Rank	#338,785 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #74 in Wind Speed Gauges
Brand	Proster
Brand Name	Proster
Color	Anemometer
Customer Reviews	4.4 out of 5 stars 806 Reviews
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	Plastic
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
Special Feature	Portable
Specific Uses For Product	Wind Speed
Style Name	Compact
UPC	753807579186
Unit Count	1.0 Count

Reviews

B**W

3.03.2019

G**R

1.03.2026

M**O

18.06.2018

B**E

20.06.2019

M**Y

2.12.2020

R**M

28.11.2016

I**E

3.04.2019

B**N

3.07.2018

M**T

1.07.2018

C**R

2.08.2023

A**R

27.10.2021

L**O

6.08.2025

S**R

11.05.2021

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R1369

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In stock

Sold byAmazon South AfricaDelivered 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 South Africa.

Secure transaction

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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

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