Core 5mw Green Laser Pointer Series ,$30

The world's brightest 5mW laser pointer is the Core series which produces a brilliant consistent beam at 532nm green. With improved diode stability and longevity, this is not your typical green laser pen. Makes a great gift or gadget for every tech lover and runs on 2 simple AAA batteries.

The Core is the world's most popular and durable 5mW green laser pointer.
 

  Model: CORE 
  Size: 13x148mm
  Wavelength: 532nm
  Laser Body: Black Polished Brass 
  Transverse Mode: TEM00
  Output Power: 5mW
  Beam Divergence: 1.2mRad

http://www.thinklasers.com/core-5mw-laser.html