Dynamic balancing rigs for crankshafts use gram-inches.
Dynamic balancing rigs for propellers use inches per second.
I believe the latter is
not directly RPM dependent. The measuring device (which incidentally senses prop rpm and position - optically from a piece of reflective tape) will show the IPS figure and that figure then hardly varies as you wind up the RPM from idle to say 2400.
Cranks are also sometimes measures in inch-ounces
At least the conversion from that to gram-inches isn't hard...