Apera Instruments provides all types of scientific instruments and sensors for measuring pH, ORP, conductivity, TDS, salinity, dissolved oxygen, turbidity, and ISE with our leading technologies, strict quality control system, and outstanding customer service. They have been focusing on the development of water analysis instruments and sensors since 1991. More than a million pieces of Apera products are being used by customers in over 50 countries. All the products are CE and RoHS certified and are manufactured by our ISO 9001:2015 certified manufacturing base. For over 28 years, they have been dedicated to providing more reliable, accurate, and user-friendly water analysis instruments and sensors, a goal we continue to strive for.