Best Spec's plugin for measuring distance between 2 elements?

Can anyone recommend the best “Spec’s” plugin for measuring space between 2 elements? I’ve tried a couple of them but they dont seem to work as expected for what I need. For instance, they measure the distance between 2 text boxes, between the top of one box and the bottom of the other. Instead of simply the distance between the bottom of one box and the top of the other…

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