How to choose a laser pointer?

There are so many different types of laser pointers, as a new beginner, one must be puzzled about how to choose them. Here, I have below suggestions from color, output power, size, price for you to learn.

1.Color. Because of different wavelength, there are 5 main colors laser pointers, they are blue violet laser pointer(405nm), blue laser pointer(445,460,473nm), green laser pointer(532nm), red laser pointer(635,650nm) and Infrared laser pointer(808,980,1064nm).They are all visible except infrared laser pointer. Green laser pointer is most used, as it is the most visible to human's eyes.It can be used in many fields, such as star-pointing.It is much more convenient when a fabulous green line pointing at the star directly, all people around can see the object without using gesture. Red laser pointer is always used for indoor meeting, like class-teaching. So, choose your favourite color.
2.Output Power. mW is the abbreviation of milliwatt.The higher of mW, the more power of laser pointer. For normal use, 1~5mW is enough, like stargazing, lecture, school teaching, business conference, issuing rescue signal, construction,mining fields, and medical teaching etc. Once the output power is more than 5mW, one should have some protective action, like wearing laser safety goggles.

3.Size. There are two main sizes laser pointer in LaserTo, one is called laser pointer, the other is called handheld laser pointer. Laser pointer is as big as a pen with the Dimension(D×L, mm) Φ14mm×171mm.While handheld laser pointer Dimensions(D×L, mm) is Φ23.5mm×180mm, like a flashlight.Both of them are portable.

4.Price. From dozens of dollar to hundreds of dollars, choose according to your fianacial situation. The most important thing, one should notice is that, no matter cheap or expensive laser pointer, it must not a shoddy. It should has CE or FDA certificate. Orelse, no matter how cheap it is, it is harmful to you,say no to it.
Also, one should pay much attention when using laser pointer,
1.Wearing a pair of goggles when operating laser pointer.
2. Don't see directly to the light directly by eyes.
3. Leave it from Children.
4. Don't point at skin when using high power laser pointer. Hope this is useful for the beginner to choose laser pointer. Enjoy your laser time.