You may even have an old pair lying around the house that you can use to build a polariscope today.
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It also is very interesting to use with your polariscope.
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Today we're going to build a polariscope.
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Putting it in the polariscope revealed incredibly colorful patterns of stress that must have occurred when the plastic got dented as the frame was being manufactured.
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More examples
Polarimeter: an optical device used to measure the rotation of the plane of vibration of polarized light
A polarimeter
A device that can see and measure the amount strain in a piece of glass by utilizing polarized light.
An instrument for studying, or examining substances in, polarized light. See Savant polariscope.
A gemologist's tool that generates a polarized light field for the viewing of gemstones. Viewing gems through polarized light may be used to distinguish one gem from another.
A device for examining the degree of strain in a sample of glass. (Either edge or surface compression).