Contrast - WCAG 1.0 & 2.0
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WCAG 1.0 2.2 Ensure that foreground and background color combinations provide sufficient contrast when viewed by someone having color deficits or when viewed on a black and white screen. [P2 for images, P3 for text]. (emphasis added)
vs.
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WCAG 2.0 1.4.1 Text or diagrams, and their background, have a luminosity contrast ratio of at least 5:1. (L2)
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WCAG 2.0 1.4.3 Text or diagrams, and their background, have a luminosity contrast ratio of at least 10:1. (L3)
WCAG 1.0 required "sufficient contrast" How could that possibly be tested - by computer or otherwise. It could not.
WCAG 2.0 is very specific - assuming you know what
Go to desktop and use color analyzer. Colour Contrast Analyzer (Google)