EMDIN02 SINGLE PHASE - DUAL MODULE kWh METER question

Hi I am interested in your EMDIN02 SINGLE PHASE - DUAL MODULE kWh METER. In the picture of the meter it has 2 lines of readings and wondered what they are for as it makes no mention of the dual readings in the instruction manual?

I am looking for a din mount dual tariff / rate internal clock switched (Economy 7) watt hour meter to accurately sub meter my 7 kW electric car charger circuit. Ideally the current rating would be 5(32). The only dual rate din mount meters I have found so far are either 3 phase or only available to order in large quantities from China.

An Economy 7 tariff in the UK a provides cheap off peak electricity from 12:30am until 7:30am GMT. Thus I charge my car between 12:30 - 7:30am but pre heat it from the main at around 8:00am So I need a dual tariff kWh meter to accurately work out the costs.

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