Decide on a color and power. The most common colors for laser pointer pens are red, red-orange, green, and blue. Red usually produces the weakest light, operating at 650nm, followed by red-orange at 635nm, green at 532nm, and blue being the strongest operating at a wavelength of 473nm.
Choose an ink color. No laser pointer pen would be complete if it wasn't an actual pen, so decide on what color would be best to have. Black is the most common, but how much sense does it make to have a red laser pointer pen with black ink? Consider matching the color of the ink with the color of the pen--or not. The choice is yours.
Get style and comfort. Ask yourself what style of laser pointer pen best represents the image you want to present to yourself and others. Style and comfort options include whether or not the pen has a comfort grip, whether it opens by twisting or pushing, and how wide the laser pointer pen is. While it would be best to try the pen out before buying, much can still be learned by looking at it.
Consider batteries. Laser pointer pens can either require AAA batteries or some less common type of battery. Decide if it will be worth it to have to go out and find less common batteries when they need to be replaced, or if the benefits of style and comfort outweigh the inconvenience. Eliminate this problem entirely by always keeping spare batteries nearby.
Determine what extra features you want. Some laser pointer pens are also key chains, function as a PDA stylus, include a carrying case, include an LED light, or operate as presentation remotes. The carrying case can be useful if you want to give the laser pointer pen as a gift, and the LED light is perfect for use as a small flashlight whenever you happen to need a little extra light.
Read reviews. This will give you a close look at the pros and cons of the laser pointer pen you're considering buying. Information you may discover includes how long the battery lasts, how bright the laser is, and other valuable information that will help you discover and choose the best laser pointer pen.