Always striving toward excellence, W&J has developed to be a market-driven and customer-oriented enterprise. We focus on strengthening the capabilities of scientific research and completing service businesses. We have set up a customer service department to better provide customers with prompt services including order tracking notice. certified calibration weights If you are interested in our new product certified calibration weights and others, welcome you to contact us.The product has passed the electro-static discharge test (ESD), meaning it has a protection system to withstand instantaneous high current.