My 810 has a display. It shows loop current and CID info, and VOLTAGE!!! The other day, I was troubleshooting a line, I put my toner on continuity, and went to the other end where is showed less than 10 ma current and 6 volts.

It may do other stuff, I would have to RTFM to know. It was less than a buck eighty and much smaller than my 22.