The ElectricUnit Meter is a device used to measure currents passing through cables or storage devices.
(Note that the name is different, this is because of an update in v.1.97, the name has been changed to EU-Reader)
This is important to know so that you don't send too much current through a cable, as that can cause a machine/storage device to explode.
You may click ANY cable or storage device to begin measurement. Clicking the same cable again will display the averagely measured EU/t and how long the measurement took place (in Ticks).
Extremely valuable for determining how to wire stuff up for maximum efficiency.
HAYO for a hayoish Tool!
See: Crafting Guide