EM1101 Anti tampering Meter and EM1102 STS Prepaid Meter are IEC Single Phase Electricity Meter. Its multi-tariff, optional communication interfaces and long-period recording abilities make them ideal for advanced metering applications. With major Function :TOU up to 8 tariffs, flexible of settings base on seasonal, holiday, and time-zone basis. Configurable 6 channels of Load Profile recording. 30 historical billing data and up to 200 events recording. Built-in IEC62056-21 optical and RS485 communication ports. Anti-tampering detection, includes: Bypass main and load line; Reverse input and output; Grounding load line; Open cover/terminal; Current flow with no voltage; Reverse current.