QPcard 101 is a neutral reference card tot manual white/gray balancing of digital photographs. The spectral response of all three patches is perfectly straight eliminating problems with metamerism in any light.

The card itself is self-adhesive making it perfect to plave on almost any surface in the scene.

• White, neutral mid grey and black patches
• Self adhesive surface
• Fade resistant
• Scale reference (mm)
• White patch is free from fluorescent pigments
• Grey patch reflects 18% of the light

The current version is v4 with a millimetre scale on the long edge.