Located in Columbus, Ohio, Apera Instruments provides all kinds of scientific instruments and sensors for measuring pH, ORP, conductivity, TDS, salinity, dissolved oxygen, turbidity, and ISE with our leading technology, reliable product quality, and outstanding customer service. We have been focusing on the development of water analysis instruments and sensors since 1991. Our sensor and electronics technologies have gained recognition in over 30 countries across America, Asia, and Europe. All the products are CE certified and are produced by our ISO 9001:2009 certified manufacturing base in Shanghai. Apera's products contain our passion and persistence for the precision and reliability for various applications, including water treatment, agriculture, aquaculture, beer brewing, pools and spas, etc. We look forward to becoming your best partner for water analysis.