If you want to read EHA current, you'll need MB part # 102 589 046300 or reasonable facimile. I'm reading it straight off the tag.
Again, I bought it from baumtools.com. I'm sure there are other places that sell it.
Some MB dealer sells tools/test equipment and some do not. The one in my area will not sell any special tools.
The part is mentioned by number in these threads:
http://www.peachparts.com/shopforum/search.php?action=showresults&searchid=563285&sortby=lastpost&sortorder=descending
The part number varies in some cases.
Look at these threads and also search on EHA.