This has already proved useful. Instead of testing cables for >0.5A capability by plugging in my 20AH battery and seeing whether or not it charges overnight, I can throw away the totally bad ones and use the low-current ones only where appropriate. I didn't look at separate documentation because the labels on the device are self-explanatory.
Quality product that works great! I have a pile of cables. Now I can sort (and mark) cables to separate charge only from charge/data cables. I can also test cables to determine if they are intermittent or bad and get rid of them. Fast shipping & great communication from the seller. The board is high-quality. Soldering and component placement looks great. The only thing that would make it better is if it had an Apple lightning connector as well.