From several comparisons of DILAGON readings to microscopic examination, I estimate my DILAGON measurements are accurate and precise to c. 1 degree for well-behaved edges.
This knife was sharpened yesterday with a Tormek T-8 set for 15 degrees. It read 15 degrees on the DILAGON:
This knife was sharpened yesterday with a Tormek T-8 set for 15 degrees. It read 15 degrees on the DILAGON:

