How to buy a laser pointer -- Guidelines on how to buy the right laser do

Different types of lasers
Color
Laser is present in the red (632 nm), green (532 nm), and blue (473 nm), orange (594 nm) and infrared (808 nm to 1064 nm).Laser color determines the visibility of the laser beam and the price, attractive.Laser color uncertain laser energy.
Power
Laser power level measurement in mW which is an acronym mw.The range of available power from 1 kW to 400 mw.Power is a key factor in determining the possible application of laser and laser price.Power also determines the laser hazards.
Size
The size of the laser can range from a small size AAA battery the size of a baseball bat.The laser pointer is the two most common size on the laser pen size, portable laser small enough to fit in your pocket and larger hand size.
The on / off switch
The laser can be two types of switches, instantaneous opening or closing pressure switch and a standard Click to open or close the switch.Switch type determines the laser can be used or not.Many applications need to use laser is not free.
Safety features
Safety properties can range from zero to a fine range of keys, software dog, lens shutter and time delay.
Laser you deserve?
It all depends on what you want, laser your budget.
Demonstration
The blue and green laser is the best for the lecture because blue is the most impressive, is also the most expensive.A very important point and buy the demonstration of laser is power.Never buy laser power more than 5-10mW because the danger of your audience and your self.