Is there anyway to tell the cathode from anode?

Is there anyway to tell the cathode from anode?
I purchased an apex type A 18v tdcs device and there is the two inputs and colored cables but when I look at images online sometimes the red and black are swapped on the same device. You can easily unscrew the red and black caps that are on the device and switch them. I was just wondering if there is any way to test which is which to make sure I'm using the device correctly? submitted by /u/Vileath2 [link] [comments] ... read more
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