Manual White Balance for Underwater Still Photography
The Grey White Balance Colour Card
Amazon.com : Anwenk Grey Card White Balance Card 18% Exposure Photography Card Custom Calibration Camera Checker Video, DSLR and Film : Electronics
The Grey White Balance Colour Card
Keldan ships Color Checker card :: Wetpixel.com
Shooting Video With Basic dSLR Equipment - The Basics
DGK Color Tools WDKK Waterproof Color Chart WDKK B&H Photo Video
Amphibico Aluminum White Balance & Color Chart ACWB1117 B&H
Amazon.com: Foto&Tech Waterproof Premium Set 18% Grey Card White Balance Card Exposure Photography Card Set Custom Calibration Camera Checker for DSLR Video Digital and Film Photography (5 x 7 Inch) : Electronics