VetroSafe® Guardian OTG + VSF Click2Shade #3-to-5 Split Lens Lens Type:VSF Shade 3.0 + Click2Shade 5.0 The VetroSafe® StrainView is a

The VetroSafe® StrainView is a system for viewing strain birefringence in glass and polymer objects

and can be washed normally for a long useful life

Polarized Viewing Glasses (Fit-over Style)

Tip: For best results

This 52mm diameter filter is extra large to fit on flagship phones with multiple camera lenses such as the iPhone Pro and Samsung Galaxy

VetroSafe® Guardian OTG + VSF Click2Shade #3-to-5 Split Lens Lens Type:VSF Shade 3.0 + Click2Shade 5.0 The VetroSafe® StrainView is aThe VetroSafe Guardian OTG (Over The Glasses) is a "fitover" safety glasses frame capable of being worn over regular glasses, or by itself as a standalone safety frame. The Click2Shade 3 to 5 Split Lens system provides a magnetically attached Shade #3 + Shade #5 split lens arrangement for increased blocking of visible and infrared light in the lower portion of the field of view. For over the glasses use, the maximum compatible frame size is 135mm