My manual gives 1.2MM (47 thousandths) as the maximum service limit, for top ring and second ring,
there is also the thickness of the ring to consider,
Top and 2nd rings: 1.44 MM (57 thousandths), says to measure in several different places and if the measured value is smaller than the listed number to replace the rings.
i know its a pain in the rear to do, but i would remove the engine and have a machine shop mic the cylinder to check for wear, because it is common for the cylinder to wear more than the rings. But that's totally up to you to decide as what you want to do.
I can't argue with buying a new ring set and honing it.