when I had two of my ~20 year old brushed servos go out, I replaced them with ClearPath units. This has been a few years ago and they are still doing an admirable job. Very silent also.

I chose them to retrofit as it was an easy replacement. They include all the electronics for step/direction and was compatible with my existing power supply. So for me it was a no brainer. Hooked up the step/direction lines and the power cable. Did a new calibration and was back in business.

Cant say about the DMM as I have no experience.

Good luck.