I just bought this blue laser from a dude in China, but it's without batteries and I am not sure which ones to buy. It needs two 16340 batteries, he says.
The laser should be able to power out 200mW (real output power the seller said, although it says lower in the add). I tried a 18650 3.7V...
What laser would you recommend for UFO watching and communicating?
Most cheap lasers on amazon or Ebay are sold as 5mw. Some say, they are actually more mw than that. Others say, they are probably lower in mw than the specs are saying. A lot of them don't even have specifications at all.
How...
I have for some time been looking at lasers to buy, but it's a confusing market and I still don't know, what and where to buy.
I need a laser for sky watching. It should be able to reach up at least 5 km, so I have been looking for high power lasers around 200-500 mw. But most lasers online...