Euro Tech Holdings Company Limited engages in the marketing and trading of water and wastewater related process control, analytical and testing instruments, disinfection equipment, and supplies and related automation systems in Hong Kong and in the People's Republic of China. It sells analytical instruments, such as spectrophotometers, colorimeters, turbidimeters, ion-selective electrodes, chemical oxygen demand and digestion apparati, and precision re-agent dispensing devices, as well as chromatographs, mass spectrometers, flow injector analyzers, automated sample preparation workstations, and atomic spectrometers. The company offers environmental monitoring instruments, such as air and water quality monitoring instruments; sample pre-treatment equipment; and general-purpose laboratory instruments consisting of water quality monitoring and analysis equipment. In addition, it distributes general testing and measuring equipment, including multi-channel digital and analogue recorders, signal amplifiers, and calibration equipment for energy conservation, renewable energy equipment, power quality analyzers, and continuous emissions monitoring systems to power plants, railway and aero-space industries, utilities, educational institutions, and telecommunications companies.