You've had a few people tell you that there is no easy test. You really aren't going to talk your way around that. We're not holding out, there is not "gotcha". Spectrometer - that's what that hand held device is. But to test the hardness of steel, they do sell hardness testing file sets. Sharpness and slow wear of the edge are different things. White steel gets extremely keen, but for a given HRC it doesn't keep its edge well. D2 takes a long time to take and edge, loses that "fresh off the stones" feel fast enough, but doesn't get really dull for a while. While I'm fine with VG-10 for multiple uses, I hardly think it's the best steel.