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You can use this laser as an spot type laser if you remove the lens. It work well.
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Bart van der Burgt | 2010-08-28
The red line laser is a bright laser, and works on 5VDC. Be cautions when connecting/controlling it with an MCU, as it can draw up to 40mA. Arduino can JUST handle it, so I recommend switching it with a mosfet or transistor, or whatever else you have handy.
Note that the red line PROJECTS a red line onto your target (e.g. wall). So you cannot see "a red line" between your laser and your target - an actual line is projected ON your target. If you want a laser that projects a DOT on your target get the red dot laser (this is like a laserpen). These are _ 5mW lasers so they display very well on your target (very very bright), but you will not see a line between your laser and the target (you'd have to get a 100mW laser I think, but those are illegal in most countries).
All in all, great product, you could make tripwires with this and such (probably better with the dot one). Perhaps even try to make a laser thermometer!