Stylus gauge recommendations ?

+1 on the Riverstone

I forgot to mention, because it should go without saying maybe, that you do have to be careful that the weigh pan is nonferrous (i.e., will not be attracted to the magnet in any cartridge), and must gauge the force at approximately the level of the surface of an LP mounted on the platter surface. So the weigh pan should be above the platter surface by about the thickness of an LP.  Surprisingly, some of the cheap ones appear to use stainless steel with a low level iron content. Seems the Riverstone is OK on that score.

I have a Metrosound and a Shure, plus a digital one with two decimal points.

Digital is easier but all can work just fine. The last one is your ears.

The Riverstone is all you need (great design, good build quality, simple to use), and it's cheap: $32.79 on Amazon.

The Riverstone measures VTF very close to the level of a record. Important for many tonearms.