Micron Instrument Co. Supplies Specimen Set/ Comparator Samples. 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 Specimen Set are used as comparator samples having different patterns of flatness such as Optical Flat, Convex, Concave etc and mainly required for technical institutes and colleges and are used with monochromatic light unit. For measuring faces, this micrometer is basically used as comparator.