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 W291D384H388mm Measuring range 0-280nm Weight 11Kg Viewing field W200D200mm Measure height max259mm Light Source Warm white LED light 10W Power DC 12V(with a AC/ DC adapter)