Bad ETA3105 Kelvin Clips.
I bought the ETA3105 Kelvin Clips in 2020, from Franky's, also know as 99centHobbies (ebay seller f-t-2000), and they are crap. The metal didn't look right, so I measured the continuity of the tips of the kelvin clips with an ohm meter (the ohm meter had good gold plated probes) and many times there was no connection at all, even when pressing firmly with the ohm meter probes. Other times the connection was marginal at best, but no where close to zero ohms. They are advertised as gold plated, but I don't think so.
These kelvin clips are highly recommended by many people, so I don't know what is going on here. Are these counterfit? I don't know. I have bought other items from this seller and they were good, and this seller is highly recommended on this forum.
I eventually bought some BK Precision TLDK1 Kelvin Clip Probes and the make very good connection.