This Novoflex Zebra Check Card allows you to make sure your exposure and white balance settings are right on the money. One side is middle gray, which is perfect for taking a reflective meter reading to ensure that your tonal values fall into the correct range. The other side is white for setting a custom white balance. The accuracy of these values is very important for critical work. This flexible check card is constructed from a special polymer and has an anti-reflection coating on both sides.