Want to know if your glasses are polarized? Look no further than these polarized test cards.
When viewed through polarized lenses an image will appear that can not be seen by the naked eye or glasses that are not polarized.
Want to Wow your family and friends? Here you go, be the life of the party when you whip out your polarized test card. Now this is how you make an entrance.
Literally makes a great gift card.
Package includes 4 polarized test cards.
Might as well buy two or more packs as everyone you show it to will want one.