2025 Price Adjustment Letter Dear User Partner: Hello! Thank you for your trust and support for Restek. Our company adheres to the service concept of Plusl to provide you with high-quality products and services, and fully assist Chinese users to achieve professional and efficient chromatography work. Your recognition of Restek products and services is our greatest motivation. In the case of rising production and operating costs, in order to continue to provide high-quality products and services, our company will adjust the catalog prices of related products. The new prices will take effect on March 1, 2025. For detailed price information, please contact Restek China (Restek) sales staff, or contact us through the following channels: Toll-free hotline: 4000-815-005 Official website: www.restek.com

GLSciences Product Price Change Notice in February 2025 Dear users: Thank you for your continued support and trust in GLSciences chromatography analysis products! GLSciences adheres to the principle of user first and is constantly committed to improving product quality and service! Due to the increase in operating costs such as raw materials, manpower, transportation, and warehousing, our company will adjust the price of the product, and the new price will be officially implemented on February 20, 2025. For specific changes in product prices, please contact our sales staff or authorized agents, or call our company at 400-089-1889 for consultation. We hope that our users will understand the inconvenience caused by this price adjustment! We will also continue to improve and perfect. As always, we will create high-quality products and provide better services to our users!

The website of Beijing Hengyi Yinghe Biotechnology Co., Ltd. is officially launched，The product is being continuously updated, welcome to visit!