SJ was founded in 2003, has been designing and manufacturing all kinds of high quality potentiometers professionally. We have a professional manufactory which covers more than 7,000㎡. And it is equipped with a variety of automatic production equipment, including air press, pneumatic punch press, glue dispensing machine, riveting machine, assembly machine, etc. We produce custom-made electronic components to meet your requirements with competitive price and timely delivery. Our manufactory obeys ISO9001 quality management system and all products needs quality test strictly before delivering to customers.