Function 1.Observe stress distribution in transparent plastic, glass products and optical crystals 2.Measure retardation caused by internal stress in glass and optical crystals Detecting object 1. transparent glass products with complex construction. such as : penicillin bottle, ampoule , mobile phone cover, light tube, light bulb,solar glass ,automobile glass,sapphire, glass container , glass handicraft 2. transparent plastic samples plastic bottle , cosmetic bottle , beverage bottle, contact lenses, plastic tray plastic film 3. optical crystals such as quartz , SiC, calcium fluoride Detecting methods Sensitive Color Method and Senarmont Method Specification Model PSV-413 Size W291 D384 H388mm Measuring range 0-280nm Weight 11Kg Viewing field W200 D200mm Measure height Max259mm Light Source Warm white LED light 10W Power DC 12V(with a AC/ DC adapter) Others: 1.Polarizing light field intensity : 120cd/m2 (10W LED lamp) 2.Polarization degree of the polarizing material: 99% 3.Polarization field: 200*200mm 4.Instrument structure: a 1/4 wave plate in the analyzer and a full-wave plate in the polarizer (wavelength 565nm). Slow axis of the plate is at 90 to the polarization plane .5.A dial on the Analyzer is used to measure the rotating angle (range: 0-180 )