Pocket Voltmeter with Pass-Through port

I have an Esk8 that I didn't want to permanently mount a voltmeter in because space was tight and I didn't want to cut on the CF enclosure more than necessary. So I came up with a Pocket Voltmeter with Pass-Through charging port.

This allows you to plug into the cahrge port on your Esk8 (or wahtever) and see the voltage plus you can then plug your charger into the pass-through port to monitor charging.

This is what you need as far as parts.

5.5 x2.1mm DC Power Socket
https://www.e