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|Sat Jul 13, 2002 - 10:58 PM EDT - By Kenneth Crandall|
pointers are a fairly new and useful technology, which have dropped quite
significantly in price over the last few years. Now, standalone laser pointer
keychains are available for under $10. Laser pointers are convenient for
teachers or for any type of presentation. If you write, have a PDA, and give
is for you. It combines a stylus, pen, and laser pointer all in one.
The pen works like any other pen stylus combination. To change between the two tips, simply rotate the lower portion of the pen. The pen comes standard with black ink. However, you can purchase refill ink in black, blue, red, and green. Simply pull on the bottom to replace the ink.
The top of the pen contains the housing for the laser pointer and the batteries which operate the pointer. A laser is a device that controls the way energized atoms release photons; LASER is an acronym which stands for Light Amplification by Stimulated Emission of Radiation. I could go into a detailed explanation of the relationship between quantum mechanics and how laser radiation works. However, it is much simpler to say that a laser is a very intense focused beam of light energy.
The type of laser you find in this pen is very typical for a laser pointer. It operates at a wavelength of 650nm, giving this laser a range of about 500 yards (1,500 feet). It requires 3 small LR41 batteries, which is a lot considering they only provide around 30 minutes of continuous use and cost around $5.00 for the three. One drawback of lasers is that they draw a lot of power; but, try lighting up something 1,500 feet away with your mag-lite.
To operate the laser, simply press the button to the right of the clip. To open the compartment and change the batteries, unscrew the top. Also, when you replace the batteries they rest face up in the compartment.
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