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) :
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...