Ok, now I get it.

It's not really a 12 channel oscilloscope, it just an enhancement that hooks into the MB Star Diagnostic Compact (3 or 4) to chart datastreams from the actual scantool.

http://service-parts.mercedes-benz.com/dcagportaldocs/brochures/DC_Br_GB_HMS990USB.pdf

Do you already have one of those?

__________________
A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.