Pomona 6303:
Don't buy. Wires are connected inside the tip, so you don't compensate for the contact resistance.
My personal favourite (I am not a professional EE) is this:
Sold as "UNI-T compatible". Goes for $25-30 delivered on ebay or $20 on aliexpress. Very solid construction, gold-pated clips, flexible wire.
I have some cheap "traditional" clips from ebay, but the plating matters
If you need "tip" connection as oppposed to the "crocodile"-style connection, you may consider Mueller BU-7042-F-48-2 (and there is a mating black one):
but the tip spacing is about 4mm and it does not really work for SMD.
I think that the best SMD-style kelvin probe could be two parallel pogo pins. Solder wires, wrap one tip with scotch tape, put botth of them in a heatshrink tube so that they are parallel, put result into an old pen, and you should have good kelvin clips! Haven't tried it myself though.