Which colours EXACTLY (colour code?) do the colours have? No information on this, neither on the internet nor in the instruction manual. If I have to adjust the colours in Photoshop by feel, the product is virtually useless. Better to invest more and buy Xrite colourchecker or something.
Pro
cheap
foldable
Well protected from scratches etc
WB works more or less (+-100 kelvin accuracy, in my measurement)
Contra
what EXACT colour (colour code?) is the red? The green? No info on that...