With the help of the exposure profile, we can easily set the exact white balance, even during post-production.

This neutral reference card is the perfect solution for measuring and accurately setting gray or white balance. Three spectrally neutral shades of blackening: white (95 * 0 * 0), medium gray (48 * 0 * 0) and dark gray (35 * 0 * 0) are included in 3 40x40 mm square spots. This light reflected from three matte gray surfaces is perfectly suitable for calibrations, because spectrally it means an almost straight curve.
When using the card, we can easily balance the grayscale and use accurate measurement to get the correct exposure, so the image will be balanced.
The black square (95% gray spot) is suitable for determining the richness of detail that can still be detected in dark tones.
The middle square is the matte neutral gray spot that reflects 18% gray light, which is suitable for basic and precision exposure purposes.
The white square is free of fluorescent and bleaching agents, perfect for adjusting the individual white balance of the camera before taking a photo.
There is a reference millimeter scale along one side. (This is suitable for calculating the degree of magnification, e.g. for close-up photography)
The card also contains self-adhesive, so it stays perfectly on almost any surface on the scene. Of course, it is also sufficient to hold the card perpendicular to the camera or spot light meter's sensor surface and expose it to the image.
The QPcard 101 calibration card is a small, easy and inexpensive way to calibrate the contrast.
The 3 QP cards are in a protective resealable foil bag that fits easily in your camera bag or pocket. Card size: 142 x 40 mm.