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Hi. These engraving lasers differ greatly in price. Do they differ greatly in performance ?

Hello. Just bought this rechargeable $6 red pointer from curiosity, housing is plastic; do you know what battery is inside, if it is replaceable, is the housing openable or is it a disposable ? Cannot unscrew it other than the lens :(

Hi. This black screen is not of my preference. I there a normal 'light' style to choose ?

Good day. A chinese cheap and common 1500mW violet engraving laser 12mm module focuses to about 10 cm with its supplied lens adjusted all the way in... What lens can be installed instead to focus at ~10m, or beyond ? It is not for engraving.

Hello. Please recommend a housing that can receive a 18650 cell; and a module like pictured below. Did not see something alike at ebay and others :( Should be very waterproof like these with side switch, (not at tail) :

Hello. Is there any provider for the sliding magnet captive in a groove assembly to be mounted outside of a plastic tube ? The reed switch itself, I have a bunch; is simple to find. It makes it truly waterproof. Used also in this one:

Good day. First post with lots to learn. How to produce a ~3mm dot at 6 metres (1/8" at 20') with a 405nm module like this 12.2mm diametre, ~46mm long module that has some lensing on it. With its lens all the way in, the beam still diverges. Do I need a housing with lens or collimator or both...