Euro Tech Holdings Company Limited operates as a distributor of advanced water treatment equipment, laboratory instruments, and power generation equipment across mainland China, Hong Kong, and Southeast Asia, while also providing engineering services for water, wastewater, and air pollution control projects through its subsidiaries. The company generates revenue through three main streams: product distribution and sales to industrial operators and municipal authorities; engineering contract work spanning design, implementation, and project management; and the sale of ballast water treatment systems for maritime industry compliance, which serve both vessel retrofits and port-based applications. The business model relies on point-of-sale recognition for product distribution and milestone-based revenue recognition for multi-month or multi-year engineering projects, serving customers including industrial operators, shipowners, petrochemical facilities, and port operators primarily in Asia and emerging international maritime markets.