GMAT Sentence Correction (SC) | Re: The electronics company has unveiled what it claims to be

in a structure like above (Sub + Verb, Verb-ing modifier) where sub + verb is the clause "the length of which is ..."
the verb-ing modifier "weighing" can do two things
1. either modifies the previous clause and associate with the subject of the clause,
2. or provides the result of the previous clause ...

So, in option E..weighing does neither of the job ...
if we consider case - 1, then weighing refers
...

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