Characteristics: quick, large test thr-ough measuring the phenmenon of d-ouble refraction created by internal stress of transparency material; widely used in the fields of optical glasses, glass products and transparent plastic products.

• 通过测定透明物体由于内应力而产生的双折射现象来进行快速、大量的检验。广泛应用于光学玻璃、玻璃制品、透明塑料制品工业。