When the traditional white light ray boxes do not provide strongenough rays to be seen across a classroom of ambient light then we recommend this 635nm wavelength, 3/5 ray, monochromatic (laser) ray box, power
When the traditional white light ray boxes do not provide strongenough rays to be seen across a classroom of ambient light then we recommend this 635nm wavelength, 3/5 ray, monochromatic (laser) ray box, power
