Located in Changzhou, Cotest Co., Ltd. was established in 2019, focusing on the research and development, production, sales and service of optoelectronic semiconductor device testing equipment, and is committed to helping users accelerate the completion of the link construction from R&D test and sample production, small batch testing to mass production testing, and providing users with diversified test products and solutions. Cotest has become a relatively complete optoelectronic semiconductor test equipment and service provider in China, solving the " stranglehold " problem of test equipment for the production process of optoelectronic semiconductor devices, and has also become a partner of many domestic leading lidar companies in the field of testing.