100mw 405nm Handheld Adjust Focusing Violet Purple Blue Laser Pointer with Double-protection device SD-300 ,$64

Specifications:
Aluminum body construction
Adjustable Focus Violet Purple Blue Laser Pointer with Double-protection device
Perfect for astronomy, presentation, tutorial and office meeting
Produce clearly visible green beam in the dark
Laser Color: Violet Purple Blue
Operation Voltage: 3.0~3.7V
Power Supply: 1 x 18650 battery
Laser Wave Length: 405nm
Laser Output: 100mW
Storage Temperature Range: -10~+50°C

http://www.laserpointerworld.com/blue-laser-pointer-100mw-405nm-handheld/