Onyx now lists the actual Agtron roast level / now has service charges - Page 8

Discuss flavors, brew temperatures, blending, and cupping notes.

#71: Post by Jonk »

It's probably a question about grind size and protocol. Have a look at the graph in DIY Color Meter

The spread is less, but with an even finer grind size (70µm burr gap is recommended with the meter in that thread) it might be the same.