CPPOTW = The Digital Grey Kard
It seems someone is always selling a gadget to get your white balance right. It can indeed be useful to have a grey reading to get your white balance spot on out of the gate. This CPPOTW is the Digital Grey Card.
WB targets work quite simply. Their an 18% gray. You shoot a frame with the gray card in the scene, then later in post production you click it with the WB eye dropper using, Lightroom, Aperture, Camera Raw or whatever you use. The system reads, what you say is 18% gray and balances the rest of the scene accordingly.
I‘ve tried a few targets, and aside from being overpriced many of them are cumbersome, which means I tend not to use them. This set however is like having three business cards on a lanyard. Throw it in your bag, or better yet around your neck and wherever you are you can toss the card in for a WB target shot. It also includes white and black level target.
Nothing big, strange, or expensive. At around seventeen bucks, it may seem like a lot for three plastic cards, but these targets are cheaper than most and do just what they need to. Something every photographer should have in their kit. I’ve linked to Amazon. I’m sure you can find it all over, but the price is right.