Shades of Grey Test
To test your ability to differentiate between shades of grey, as required by ASME V / SNT-TC-1A and other schemes, follow the instructions below.
On a Computer screen at a distance of 30-50 cm under normal desktop working light conditions, read the numbers in each of the 25 boxes. Count how many of the numbers you are able to read. The click / touch the 'Passing Grade' button.
Eye Examination: Shades of Grey:
20 correct readings required.
Test developed by Dr. Kölbl of FMTÜVBV, Langemarckstr. 20, 45141 Essen, Germany, Tel. +49-201-8900900, www.onetb.com
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