Laser Light Source 

Compact in size, inexpensive, lightweight with low power consumption diode laser is housed in a plastic moulded case (90x90x42) mm approx., qualitatively used for ray optics demonstration and simple diffraction work as well as to indicate the points on overhead images and charts. It required three button cells to project visible red spot with a sharply focused beam of wavelength (630-680) nm with only 1mw power consumption.