Shanghai AOYI Electric Co., Ltd. is specialized in producing analog meters, digiatal meters, solid state relay, SCR voltage regulator, SCR power regulator, PID telligent temperature controller and so on. Our company has 28 years producing history. And we have twofactoires, three recearch and devlopment centres, twentyoffices in our nation. Our products stand for quality, techniques and low cost, which have been sold all over the world.