Nun brand is a professional manufacturer of various digital rotary viscometer in China. From the beginning of product research and development, strict control has been carried out in the whole process of raw material procurement, processing, assembly and debugging. After six years of actual market test, the product has been constantly updated, product quality and repair rate have reached the international level, favored by the majority of customers. Therefore, the company decided to implement a two-year warranty for all series of digital viscometers from May 1, 2011.