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Topic: Anemometer
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John Walsh
Film God
![](http://www.film-tech.com/ubbmembers/168.jpg)
Posts: 2490
From: Connecticut, USA, Earth, Milky Way
Registered: Oct 1999
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posted 05-08-2004 09:23 AM
Extech makes one for $90: http://www.extech.com/instrument/products/451_499/45118.html But it doesn't read in cfm.
The better one like Steve showed, is about $250.
It the cheap ones do not measure in cfm, but you can use a converter to figure it out. You can get a cardboard 'slide rule' calculator or get the formula : http://www.nfsrps.com/airflow_formulas.html
Be aware though, that the cheaper meters like the one above can be off by 40-50% if you don't hold it exactly right, and in the right place, etc. With any anemometer, the proper way to use it is to take several readings around the duct and average them out. If I just couldn't afford a better meter, I would try to borrow a good one and use to compare with cheap ones to get initial values.
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