Micron Instrument Co. Manufactures Optical Flats for Monochromatic Light Unit. Micron Instrument Co. Offers Spiral Couplings, Disk Type Couplings, Encoder Couplings, Floating Carriage Micrometers, FCM, Dial Gauge Calibrators, Monochromatic Light, Dial Stand used in engineering industries. The Optical Flats are used with monochromatic light unit for checking the flatness. The Optical Flats are available in sizes like 25mm, 50mm and 100mm having lambda/4 to lambda/6 accuracy.