Croxs Inxtruments Co., Ltd

Founded in 2014, Changsha Northpure Instrument Co., Ltd. is a trusted name in the field of testing instruments. Headquartered in Changsha, Hunan, China, we are a leading manufacturer, exporter and supplier of innovative testing solutions designed for accuracy, reliability, and performance. Our focus is to deliver world-class instruments that help industries, laboratories, and professionals ensure quality, safety, and efficiency in their operations.We offer a carefully engineered range of products that meet global standards of precision and durability. Our portfolio includes Protection Relay Test Set and Handheld Optical Digital Test Set, designed to support advanced testing applications. Each product undergoes rigorous quality checks and is developed with modern technology to ensure high performance and dependable resu