I also purchased mine from the same ebay seller (i.e., tangzhimin1008) as Kirman (link above). We got the new model with the double-pronged probes and, so far, it is exceeding my expectations in performance. I used it to determine that six 30Qs from the LiitoKala Factory Store were probably fakes. In this endeavor, my SM8124A readings were very consistent and reasonable. See Table 1 and Table 2 in this post for my data. Note that the average reading for the six real 30Qs (Table 2) was within the typical 1 Hz AC specification of 13.13 ± 2 mΩ given in the 30Q data sheet. This blows me away.
The cheapest purchase alternative for a SM6124A appears to be from this Ali Express Store. But there is no confirmation that they are selling the new model. Suspiciously, this store is displaying pictures of both the old and new models.