Contactless Current Meter (IN PROGRESS)

In line with a series of low-power and energy harvesting devices I would like to make a simple Current Meter which can display the amount of energy being consumed by a given machine in our lab. I imagine the unit as a standalone thing which would use the power it harvests to power itself if possible. 


Non-Invasive Current Sensor - 30A

The main issue is that this method requires a special power cord which can be split in two like so:

Image result for diy non-invasive current meter"

Using this device to monitor energy  is documented here:

Ordering this product from the U.S. is not easy at the moment and requires filling in some paper work. It’s also difficult to find european power wires that can be separated into two strands.