It's never a good feeling when you forget to white balance your camera after you shot some footage. This ColorChecker helps with just that, it's classic target design can help give your camera the accurate color consistency your picture needs. Having it in a pocket sized case allows you to bring it anywhere you please. A great little gadget that will help make sure the colors your camera is picking up are pure.
B&H Link: http://www.bhphotovideo.com/c/product/651253-REG/X_Rite_MSCCPP_ColorChecker_Passport.html