2. Huali (1970, national protected trademark, China famous trademark, Zhejiang famous trademark, Zhejiang famous trademark, high-tech enterprise, export inspection-free, Huali Instrument Group Co., Ltd.)
3. Jenny jeni (a high-tech enterprise specializing in the research and development of smart watt-hour meters, a famous brand product in China, one of the most competitive enterprises in the industry, Jiangsu Jenny Electronics Co., Ltd.)
4. Kelu CLOU (national high-tech enterprise, Guangdong famous trademark, top ten brands of electric meters, leading power equipment manufacturer in China, Shenzhen Kelu Electronic Technology Co., Ltd.)
5. Haoningda (a high-tech Sino-foreign joint venture integrating scientific research, development, production, sales and service, a national high-tech enterprise, Shenzhen Haoningda Instrument Co., Ltd.)
6. Zhengtai (China's leading professional supplier of electric energy metering products, systems and solutions, national high-tech enterprise, Zhejiang Zhengtai Instrument Co., Ltd.)
7. Great Wall Development (started from 1985, one of the domestic electric meter industry standard setters, the world's leading electronic product R&D and manufacturing enterprise, Shenzhen Great Wall Development Technology Co., Ltd.)
8. Baifu Electric Power (National Key High-tech Enterprise, Zhejiang Famous Brand Product, Key Enterprise of Electrical Instrument Manufacturing, Top Ten Instrument Brands, Hangzhou Baifu Electronic Technology Co., Ltd.)
9. Star Hi-Tech (listed company, national high-tech enterprise, one of the professional manufacturers of meters and other instruments with the strongest technical strength in China, Henan Star Hi-Tech Co., Ltd.)
10. Haixing (national high-tech enterprise, the world's leading energy metering/management overall solution provider, top ten electric meter brands, Hangzhou Haixing Electric Power Technology Co., Ltd.)