The ColorBalanceCoach, performs in extreme conditions

In a snow storm there is a natural tendency to set everything on auto and rely on the work of the camera, As you can see in the first image the density and Color balance of the image is off. The image is too dark and reddish due to the cloudy conditions and the grey tone is just normal according to your camera meter. The built in meeter tries to put everything 18% GREY.
By using the ColorBalanceCoach disc as a target you can perform a densiry reading on the gry and also a custon color balance on the same grey material and then confirm your setting by looking at the histogram as you can learm on the site.
The same principle would apply on sand or beach.