Calibrite ColorChecker Gray BalanceCalibrite ColorChecker Gray Balance Exposure 18% Gray Balance for Photo and Video from Capture to Edit The ColorChecker Gray Balance is the largest size available Gray balance card in the range, its the same size as the ColorChecker Classic Target at 215. 9 x 279. 4mm. Using the ColorChecker Gray Balance card for reflective spot exposure metering will give you the confidence that your images will be exposed as accurately as possible. The ColorChecker