This meter is a high-performance device designed for three-phase power metering. It supports 3133/230V and 3230/400V voltage ranges, which means it can accurately measure power consumption in a variety of voltage environments. About its "dual tariffs" dual tariff setting feature, this is a very practical feature that allows you to set two different tariffs based on different time periods or electricity demand. For example, during peak hours of electricity demand, you can set higher electricity prices to encourage customers to use less electricity; During periods of low demand, lower electricity prices can be set to encourage users to use more electricity. This setting can not only effectively balance the load of the grid, but also help users better control their electricity costs.