A mechanical digital meter can be single or two-rate.
To read this meter, note the main numbers only from left to right.
A single rate meter has one row of ﬁgures like the one below:
A two-rate meter has two row of ﬁgures. One row is usually labelled 'low' or
'night' and the other is labelled 'normal' or 'day', like the one below: