Topic: oboe cane density/strength tester

If you are using a oboe cane density tester, can you share a couple of things:

1) Is it worth the significant investment (about $600.00)
2) What are the numbers you are looking for
3) I have talked with pro players who are using "12" as the ideal strength/density, but will work with cane from 10-15.
4) 15+ being "soft" and suitable for novice reed makers

Thanks so much!

Rebecca Moore Oboe