mikesh
the electromechanical meters from the last 35 years with floton bearings (Sangamo, Landis&Gyr, English Electric) generally don't suffer from slowing down.
Generally they are very accurate and often within the +-2% range.
The older meters with pivolt and jewel bearing do suffer from wear and tear and can slow down as well as speed up as the brake magnet weakens over time.
Electronic meters are very sensitive to spikes on the grid. Lightning and switching surges.
Also the capacitors tend to fail and cause errors.
We had major problems with Enermet meters with faulty capacitors which failed in warm outside meter boxes.
Also LCD displays don't like big temperature variations.
The advantages are remote reading capabilities and time of use data as noderasor sais.
