... aquatic bodies. Online chlorophyll detectors have become crucial equipment in surface water monitoring, drinking water source protection, aquaculture, marine surveys, and smart water environment construction. To facilitate selection by industry users, this article introduces five companies: Shandong Renke, Vaisala, Lufft, Beijing Enterprises Water Group, and Qingdao Water Group. It focuses on analyzing the technological advantages and system capabilities of domestic professional brands, providing a reference for users in water environment monitoring, ecological research, and water operations. Shandong Renke's chlorophyll ... ... sewage treatment plants. Vaisala utilizes optical fluorescence technology, offering high precision, strong stability, and low device drift. Applications include high-end water quality monitoring, scientific research observation, high-precision monitoring of drinking water sources, and ecological observation networks. Lufft