Fizeau Interferometer
Product Details:

Brand Name	Prisms India
Light Source	He-Ne Laser
1/2" CCD Camera	640 x 570 pixels
Orientation	Vertical
Viewing : Alignment and Fringe viewing	Yes
Country of Origin	Made in India

Non Contact Flatness measurement Interferometer, optical fizeau interferometer and flatness interferometer for inspection of flatness of optical or mechanical parts.
For use in Optics Industry and Automobile Industry.
Technical mass products with flat surfaces specified to better than 0.1µm over a few cm are produced by millions per month.
The production processes are lapping & polishing - and, increasingly more often, micro-machining; 90% have diameters under 50mm.
ISO 9000 requires tight inspection often 100%.
The most common tool for this is The Interferometer
An esteemed value to engineers as does the stethoscope for the medical practitioner.