Laser pointers are most commonly used during presentations, allowing a speaker to point to areas on the display screen from across the room. Red laser beam pointers are the most common type and use a lower powered light, normally a 650nm wavelength. You can get a common red laser pointer for less than $20 today (see below for online shopping sites for laser pointers). Green laser pointers have recently become more popular and are powered by a more powerful laser (usually a 532nm wavelength), making them much more visible that red lasers. Some green laser pointers are more than 50 times more powerful than the red ones, and can even burn paper and cast a visible beam even in a lighted room. The low-end green laser pointers start at about $50 and can go up to several hundred dollars for a more high powered one.
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