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Thanks first. it sounds reasonable. different people have different views. then how can i make a judement? is one with 20mw~50mw output power dangerous?

The pointer is high powered and quite dangerous, though I doubt it is quite as powerful as advertised. You will also have trouble importing it depending on your location.

Thanks so much, Bionic-Badger. valuable information. :cool:

Thanks Bionic-Badger. yeah, exactly, the green one is not suitable for teaching. i also admit that 5mW green laser is visible in the dark but i wonder whether it can reach far enough to point star. to be honest, i ve no idea about whether the output power affects the shooting range or distance.

Thanks Bionic-Badger. but i doubt a green one with only 5w or less output power can meet astronomy needs. admittedly, i have limited knowledge about this. i just show my doubt.

i just know the green laser pointers are the prefered ones in astronomy use like star-pointing, but how much output power does it need to suit the needs best? i'd like to watch the stars with my children often and then want one for pointing use when necessary. i have one with 100mw output power...

is it "the three in one" that earns your favor? i dont think this one is a wise choice. you d better buy one from those professional site.

green laser pointers are supposed to be more powerful and brighter than both blue lasers and red lasers. Green at 532nm is always the brightest color of laser light at the same output power. That means that a 100mW of green will be seven times brighter than a 100mW of any other color, so keep...