My other old voltmeters, a DMM, & ammeters.
What was being an electrician like back in the day?
These old instruments were only found in labs. Few people could afford such luxuries.
I am thinking that early electricians used bell ringers & light bulbs for troubleshooting problems in homes & commercial buildings.
Most of the Medium Wave AM Broadcast transmitters I worked at had at least some of that sort of gear.
There was a "Sub-Standard" AC voltmeter at one place, which we used to set the PA tube filaments accurately.(It had a big, varnished wooden box, with a spirit level to get the movement exactly level).
We had, at that time, several large manned country stations, which were similarly equipped.
They had another couple at the Maintenance Depot, which were taken away to unattended sites from time to time