Zhejiang Shengdi Technology Inc, based in the United States, lists electric power meters on Global Trade Plaza, including the Electric Energy Meter Inspection Device and HS-6468B Energy Meter EMC Test Bench. The company states it was established in 2007. The Electric Energy Meter Inspection Device (HS-3303M) is a three-phase device designed to meet IR46 metering requirements, outputting various waveforms including square, peak, zero-crossing, higher, odd, sub-, and custom harmonics. It features 3 epitopes and a small structure, suitable for product R&D, model selection, and random inspection. The HS-6468B Energy Meter EMC Test Bench is used in measurement centers of start grids, power supply companies, national laboratories, industrial and mining enterprises, and electric meter manufacturers.