Recently I was looking for a new grey card since the one I've had for a while was pretty beat up. While looking I came across the X-Rite Colorchecker Passport. When it came in the first thing I noticed was it was in a nice hard case and it really is the size of a passport so it will fit into any bag easily and you don’t have to worry about it getting destroyed.
Let me start by saying I always shoot RAW (as opposed to JPG). This allows me to easily make corrections in post production (WB, exposure, color, etc). I highly suggest anyone that is serious about photography shoot in RAW format because of the capability and control you have over the photos in post.
The cool thing with the Colorchecker Passport is it has two functions. The first function is a grey card. You can either us it to set a preset in your camera (which is what I prefer to do) or you can take a photo of the grey card wherever you will be shooting and correct the white balance in post. Now when I go to shoot after I set a preset white balance using the grey card I always take a photo of the grey card as well just in case something happens and my white balance settings change I always have a backup way to set the white balance.
The second function of the Colorchecker Passport is the color correction side. Basically once you have your camera and lighting all set up (correct exposure, lighting how you want it, etc) all you have to do is put the Colorchecker Passport in the scene and take a photo of it. Personally I always take one or two photos in the scene and if Im photographing a person I take one or two more of them holding it next to their face.
After you have photos of the Colorchecker Passport in the scene taken with correct exposure and the same lighting you just continue to shoot how you normally do. If you make any major changes to the lighting or if you change scenes pull out the Colorchecker Passport and shoot a few more test shots.
The way the test shots work is using the X-Rite plugin in Lightroom it analyzes the color chips on the Colorchecker Passport in the test photo and it creates a color profile that will make the colors in your photo be accurate to what they should be.
Overall if you're looking for a way to speed up your workflow when it comes to color correction definitely check this out.