I've spent the past 100 minutes designing number characters and then using some of those to make the CR600S logotype. 

The numbers are for the TFT screen idea. Out of all the numbers, I'm least confident about 7:

Hmmm maybe it's the 1 that's actually the problem here.

It's a bit annoying that 1 and 7 look so similar. I'll just stick with the more circular design.

[Feb 27] I've come up with a 1 that I think is OK enough: