The G.E.D. stands for graphite electrode dongle.
The G.E.D. is:
Two (2) graphite electrodes;
Polylactic acid (PLA) chassis;
Copper wires; and,
Some adhesive on the base just to ensure it holds together.
Positive terminal: Cathode: Red wire;
Negative terminal: Anode: White wire;
Just hookup red to red from your power supply, there's a little emboss on the cap to indicate electrodes (now shown).
The G.E.D. can be made to various size specifications but is standardized as:
9 x 2 x 1 cm; and,
Electrodes are 8 x 0.6 cm at pre-assembled measurements.
It is appropriately sized for a 250 mL beaker (1 cup) working volume.
The G.E.D.
This was this thing that was never found back in the day:
A smartphone compatible electrode.
The App to drive the smartphone isn't ready yet: if you want to build that reach out, but basically any computer can become an electrochemical synthesizer and or detector now, they always were able to basically, just: how many people have a G.E.D.?
Your smart phone just became a breathalizer with this, or now you can get a pH measurement for your pool with your phone (just don't drop it in). You can also use it to detect chemcials in solution for your C.S.I. and or industrial waste water types, it may even be able to remediate some household wastes.
I can make bleach with it, and do that Gr. 9 electrolysis experiment, hook it up to one of those electrochemical combustion engines to power a little electrical generator to charge my cellphone with as I deplete its batteries to power the generator with which to charge my cellphone, I guess.
I can also activate prodrugs with it, so go read the website.