Hi @eric_engineer,
Unfortunately, at this point in time the inspect tool isn't available in the electronics environment. In the meantime you have the dimension tool (which I know is not the same thing and isn't as flexible) . You can also kind of hack this by using the Mark command to define a relative origin and then reading off the coordinates of the cursor to measure the length to the second point.
I'll put this in as a feature request.
Best Regards,

Jorge Garcia
Product Support Specialist for Fusion 360 and EAGLE
Kudos are much appreciated if the information I have shared is helpful to you and/or others.
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