Set of two flexible check cards takes guessing out of setting perfect exposure and color balance, that can only be achieved with high quality Mennon Grey Cards with the uniform spectral reflectance, regardless of wavelength, color or intensity of the illumination. Each card has two sides: one side white and other is grey. 

Gray side : Reflectance 17.8%; Density 0.74
White side : Reflectance 92.0%; Density 0.036
Max. deviation of reflectance : 2%
Max. error in exposure measurements : 1/8 f-stop
Card sizes : 6"x8" and 8"x10"
Core material : high density paper based composite
Gray side : with a special coating with spectrally flat 18 % reflectance
White side : covered with a special paper with spectrally flat 92% reflectance