The wires look reasonably thick, and it's only an amp and a half, so even though the wires are quite long, loosing a volt is still quite much.
But there is a weird yellow piece grafted in, and something that may look like a fuse and that can have a significant voltage drop. It also looks like a decent power supply with adjustable current limiting, so adding a fuse is not needed at all.
Switching power supplies can be noisy, and often are. I am not sur if that is relevant for electrolysis though.
You could measure the AC output of the power supply, but most DMM''s do not have sufficient bandwith to give a sensible measurement.