LONGi Meter Co., Ltd. was founded in 1968 (formerly state-owned Ningguang Optoelectronics Factory/State-owned 43430 Factory). In 2006, it was restructured and established by Wuzhong Instrument Ningguang Electric Meter Co., Ltd. It is the first electronic energy meter in China. The birth base is the only national high-tech enterprise in China that has produced electronic watches for 17 years. Over the years, Lonking Ningguang has been focusing on developing accurate and reliable smart meters for customers. A series of smart metering products that are widely used in power, water, heat and other industries.