★ Directly read nanometer level optical path difference without calculation.
★ Dual field of view zero position detection with high sensitivity.
★ Sample worktable with 45 degree automatic positioning.
★ Small in size and compact in structure.
★ Easy to operate and reliable.

Instrument Introduction:
Transparent objects can generate internal stress due to uneven cooling or other mechanical effects, leading to birefringence. Crystal materials themselves have the optical characteristic of birefringence. The WYL-4 stress meter adopts the principle of polarization photoelectric vector synthesis and optical compensation, and determines the magnitude of stress birefringence of the sample by quantitatively measuring the optical path difference of the sample. This instrument can accurately measure the optical path difference of optical waveplates and determine the stress level of optical glass. It is an indispensable instrument in the optical instrument manufacturing industry and an important tool for studying crystal minerals.

Using instruments for transportation ：
Stress gauge is an instrument used to check the magnitude and distribution of internal stress in transparent objects. Not only is it widely used in industries such as optical glass, optical instruments, glass products, and plastic products, but it also plays an important role in the inspection of safety and explosion-proof indicators in building materials, lighting fixtures, pharmaceuticals, beverages, and handicrafts. It has many applications in the fields of crystal jewelry production, geology and mineral resources, and material science. At the same time, this instrument is also an ideal teaching and experimental equipment for various colleges and universities.