Instrument testing, usually by polarizing instrument to test the structure of its crystals, through the refractometer to test its refractive index.

Now the typical means to measure residual stress are polariscope, X-ray diffraction, neutron diffraction, ultrasonic and so on.

A method of identification for low content chrysotile, crocidolite and amosite in brake rubber of bicycle by the united way of polarized light microscope and X-ray diffraction had been established.