How can I monitor circuit network signal values?

I'd like to see what are the actual values of signals in the circuit network. This would be useful for both troubleshooting and to actually have an easy way to count items in storage chests, especially if there's a lot of them.

Is there a way to display circuit network channel values as numbers?

2 Answers

Turns out you can see the signal values when you hover electric pylon that has signal wires on it:

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The wiki gives a blueprint for a digital-display

The blueprint is too large to post here, but an be found here (mirror)

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