I've found that if I don't keep my 5mw green laser warm, you can't see the beam much at all. If I keep it up the sleeve of my coat right against my arm between uses, then it works really well. Mat -----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy-bounces@mailman.xmission.com] On Behalf Of Chuck Hards Sent: Tuesday, November 08, 2011 4:19 PM To: Utah Astronomy Subject: Re: [Utah-astronomy] Green Laser Pointers $4.99 Anyone remember the impromptu tests we did at SPOC a few years ago? Most of the cheapies weren't even visible unless you were dead-on-axis, standing right next to the laser. Not much good in a crowd. In very transparent air with little water vapor or suspended dust, you couldn't see a thing. The 20mW units fared much better. _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy Visit the Photo Gallery: http://www.slas.us/gallery2/main.php ---------------------------------------------------------------------------- This message and any included attachments are from Siemens Medical Solutions and are intended only for the addressee(s). The information contained herein may include trade secrets or privileged or otherwise confidential information. Unauthorized review, forwarding, printing, copying, distributing, or using such information is strictly prohibited and may be unlawful. If you received this message in error, or have reason to believe you are not authorized to receive it, please promptly delete this message and notify the sender by e-mail with a copy to Central.SecurityOffice@siemens.com Thank you