What kind of laser pointer to buy? (wavelength, wattage)

Hi, I recently bought a few prisms, and wanted to have some fun experimenting with the way lasers would refract through them. However, when I went to go get a laser to shoot through the prisms, I realized that they were all non-visible!

So, my question is, what wavelength and power should I buy in order to be able to see the laser in the air and shining inside the prism? I'm don't know too much about laser pointers, so I figure here is a good place to ask.

Your laser is either dead or its an infrared.

Get a 532nm (green) laser for best visibility. 50mW should produce a decent bright beam. Just be careful around mirrors and prisms.

For safety when adjusting the prisms get a pair of safety goggles to protect your eyes. Here is a very cheap pair:

Uvex S1933X Skyper Safety Eyewear, Black Frame, SCT-Orange UV Extreme Anti-Fog Lens - Amazon.com

As stated above, 50mW green laser with the suggested goggles should be more then enough.

I'll pick up the pointer and goggles soon. Thanks!

Don't make the mistake of getting the pointer's reflection onto itself, it broke my red 200mW!

And buy the safety goggles FIRST.
That step is very, very, very, very, very damn important damn it!

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