A rectangular board that you use to calibrate the cameras and vision system of a Surface unit. The calibration board has two sides. The white side of the calibration board enables the cameras to take a snapshot that helps the Surface vision system build a contrast to your environment’s lighting. (You use this side of the calibration board in basic calibration and full calibration.) The black-and-white checkered side of the calibration board enables all the cameras to align themselves properly. You use this side of the calibration board only during full calibration. (You use this side of the calibration board only during full calibration.)