Micron Instrument Co. Supplies Green Source Monochromatic Light Unit. Micron Instrument Co. Manufactures Disk Type Couplings, Spiral Couplings, Encoder Couplings, FCM, Dial Gauge Calibrators, Monochromatic Light, Dial Stand, and Floating Carriage Micrometers used in engineering industries. The Green Source Monochromatic Light Unit is an eco friendly constant frequency light source to check flatness. The Green Source Monochromatic Light Unit has a power saving light source and is ready instantly when switch on. The fringes in green monochromatic give no fatigue to eyes.