An electro-optical, automatic meter reader for enabling a consumer to view and manage power consumption through a browser. The triangular prism unit has a first light entrance side, a first light exit side angled relative to the first light entrance side, and a first light transition interfacial side angled relative to the first light entrance side and the first light exit side. A trend corresponding to trend elements is characterized. The high-pressure turbo unit and the low-pressure turbo unit are serially placed with the rotation axes essentially concentric and with the high-pressure turbine and the low-pressure turbine placed adjacent to each other and coupled together by an intermediate piece configured as a flow duct.