Profile: Zhejiang Songhe Metering Co., Ltd. is a manufacturer of KWH meters. The single-phase electricity meters of DDS446 type are designed for active energy measurement for direct connection in single-phase low voltage mains with frequencies ranging from 50Hz to 65Hz. The meters comply with both international standard IEC 61036 and Chinese standard GB/T 17215-1998. Our meters feature simple structure, low power loss, high accuracy & reliability resulting from the adoption of LSIC and other advanced technologies.