Got some tiny magnetic reed switches really cheap yesterday (25c), and did a little testing... found that a DX neodymium mini-magnet will activate them at about 1/2 inch distance through shrink tubing. So... my next laser will have a built-in hidden switch that will change it from a 5mw pointer to a 200mw burner just by moving the magnet from the tailcap to a different spot on the body!
found lot of 100 on eBay - made a post on Group Buys
DanQ
found lot of 100 on eBay - made a post on Group Buys
DanQ