I modified an old voltmeter (dial panel meter) to change it's range from 15 - 30V to a range of 2.5 - 5V. On the face it mentions it has 1kOhm/V. There was a 30K resistor inside it, but I replaced that with a 4.7K resister.
All seems to work well with it reading ~1mA at full deflection at ~5V (near enough).
The bit I want to learn about is what is it about this voltmeter that causes it to have a starting deflection of half the full deflection voltage? Is there something in how the coil was constructed that does this? I googled few things and haven't been able to help my learning on this matter.