Every shutterbug expects to capture photos with rich color levels. Look at this large gray card which will help to achieve precise exposure. This gray card could balance the light on complex environment and show 18% neutral gray; and the light meter will record the reflected light of this gray card to gain the accurate exposure. This gray card has two sides. The white side can correct white balance and the gray side used as a reference area for exposure metering. With this gray card， you can easily shoot high-quality photos. It is really the necessary device for photographers.                                    Features            With a strap， portable to convenientOne gray card has two sides. The white side can correct white balance and the gray side used as a reference area for exposure metering.High density PVC material， durable in useHelp to gain precise exposureA great helper for photographers                                                             Specifications             Gray Side     Reflectance 17.8%; Density 0.74    <br> Max. Deviation of Reflectance     2%    <br> Max. Error in Exposure Measurements     1/8 of F-stop    <br> Material     PVC    <br> Card Dimensions     (8.5 x 5.4)cm/ (3.35 x 2.13)" (L x W)     <br> Strap Lengths     50cm / 19.69"    <br> Weight     58g / 2.05oz     <br>                                                             Package Includes            1 xStrap<br>3 x Small Cards<br>1 x User Manual<br>