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I used to make holograms and the old rule of thumb for red HeNe lasers was 1mw was fairly safe, 5mw was approaching hazardous and 10mw was when you were always careful. Now these pointers are starting at 10mw if not a great deal more. Apparently many are more powerful than the spec suggests. 

Erich Rose

Erich Rose Design
Austin, TX 

Sent from my iPhone

On Mar 21, 2013, at 10:44 AM, "Glenn A. Walsh" <[log in to unmask]> wrote:

> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related institutions.
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> 
> Laser Pointer Hazards Measured by NIST Scientists
> 
> Using a low-cost apparatus designed to quickly and accurately measure the properties of handheld laser devices, National Institute of Standards and Technology (NIST) researchers tested 122 laser pointers and found that nearly 90% of green pointers and about 44% of red pointers tested were out of compliance with federal safety regulations. 
> 
> http://spacewatchtower.blogspot.com/2013/03/laser-pointer-hazards-measured-by-nist.html
> 
> gaw
> 
> Glenn A. Walsh, Project Director,
> Friends of the Zeiss < http://friendsofthezeiss.org >
> Electronic Mail - < [log in to unmask] >
> SpaceWatchtower Blog: < http://spacewatchtower.blogspot.com/ >
> 
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