The Zero-RU Inline Meter extends real-time aggregate power monitoring intelligence to any non-intelligent power distribution unit (PDU) device installed in a rack or cabinet enclosure. The inline meter is installed as part of a primary/secondary topology, where the all critical intelligence and power supply for the power adapter is retained within a connected gateway. The inline meter allows for multiple mounting options. Data captured from the inline meter is used to display operational data through connected gateway firmware or through Panduit SmartZone Software platforms.