When buying a laser pointer, there are a few things you need to know in order to safety

I'm not sure whether people buy these laser pointer to know all the complex details, how they work, or whether they are happy, they do work, they can use their fun.
I think you need to know more than it will be in the extent to which point.
One thing you might be interested to know that -- your beam remains constant width in the distance measurements when it left pointer?
Does it expand and how much distance measure its far away?
You want to have a look the most bright? If you then I think you have to go green.Identification of human eye more bright than other green color, because it is in the low range of the color spectrum.
Say you have a red 5 MW pointers and wavelength of 640 nm and you have a green 5 megawatts of pointer and wavelength is only 533 sea miles, is a given fact will appear more bright green.
A nanometer (nm) is a measurement of the distance is 1 to 1/1000000000 meters.
I recently read some very interesting about making hologram with laser pointer.I can't explain how it is achieved here, but if you're interested, you can easily find online.I believe that this is not a thing. But if you are interested in this kind of things you can learn.
It is also a good idea to see what type of laser and the use of factory production materials.Design and you don't want a bad, is out of date or production with cheap material adverse, the look and feel of your laser may be "pretty cool" unless you go with the traditional pen laser eyes still should have its own attract it.
Each of the laser pointer is the design and quality of different and important to do some research on any model decided to buy things with you, no matter how cheap may.Sometimes the laser the cheapest is actually a terrible deal, so keep a head and browse a bit so you know you have something worth your time.