This PL filter is shaped like a magnifying glass that allows you to quickly check the PL effect at the shooting site. You can check the effect of the filter before taking pictures. PL Checker V (II) is more affordable than previous products. With convenient markings to check the PL effect, you can easily determine the effective rotation angle position when used with the Circular PL(W) vernier filter (sold separately). Comes with a neck strap for easy portability.