Adorama QpCard 101, 3 Cards with Black / Gray / White Colors used for the White Balance System of Digital Cameras. Review

<B>Adorama QpCard 101, 3 Cards with Black / Gray / White Colors used for the White Balance System of Digital Cameras. Review</b><P>http://tinyurl.com/musjcqd <P><P> Adorama QpCard 101, 3 Cards with Black / Gray / White Colors used for the White Balance System of Digital Cameras. <P>Gray balancing of the light.<P>18% gray field for balance and exposure adjustment.<P>White-point settings.<P>Black-point settings.<P>Millimeter scale for size reference.<P>