Lapshine high performance Monochromatic Check-light measures the flatness of finished components in the range of 1 light band or 0.3 Micron with the help of Lapshine optical flat. No skilled technician is required to measure the flatness accurately, using the Lapshine monochromatic check light. Its exceptional design prevents the penetration of extraneous multi wave Length Light from outside sources. It can be placed near the production operation