Coulometric (coulometry) principle; 5.7-inch display with keypad operation and automatic calculation; measuring range 1 ppm–100%; 200 automatically stored results with history query at any time; complies with multiple national standards and suits virtually every industry.

Hubei Shanshui Chemical Co., Ltd. is a private chemical enterprise in the Yaojiagang Chemical Park, Zhijiang City, mainly producing ion-exchange-membrane caustic soda and specialty chemical intermediates, occupying 260 mu with 248 employees.

Recognized as a National High-Tech Enterprise in 2013, the company established the Yichang Food-Grade Ion-Membrane Caustic Soda Engineering Technology Research Center in 2020 and, in 2021, co-founded an industry-university joint innovation center with Hubei University of Technology; the same year it was named a Hubei integration-of-informatization-and-industrialization demonstration enterprise. It holds 2 invention patents and more than 40 utility model patents. Its 100,000 t/a specialty chemical intermediates project was independently developed with full independent intellectual property rights, making it one of the province's quality producers of o/p-chlorotoluene intermediates.

Guided by the principle of giving overriding priority to restoring the Yangtze River ecosystem and pursuing ecological, green development, and in response to the Yichang municipal government's Opinions on the Special Rectification and Transformation of the Chemical Industry and Zhijiang City's implementation plan, the company proactively launched an overall transformation and relocation in March 2018, moving the whole enterprise forward, shifting its product mix from heavy chemicals toward light chemicals, and developing toward diversification, fine chemicals, high-end products, and green manufacturing. Its 100,000 t/a specialty intermediates project and 50,000 t/a food-grade ion-membrane caustic soda project are being built in two phases: Phase I started in May 2019 and went into operation in December 2021, while Phase II is expected to be completed by December 2022. At full run the company will have an annual capacity of 40,000 tons of o/p-chlorotoluene, 20,000 tons of o/p-chlorobenzaldehyde, 40,000 tons of o/p-chlorobenzyl, and 50,000 tons of ion-membrane caustic soda.

Aiming to become an excellent chemical enterprise, Shanshui Chemical implements the development concept of green, smart, and innovative growth, continuously upgrading its production units with modern advanced technology to save energy, cut emissions, and improve quality and safety; it keeps strengthening industry-university-research cooperation and innovation capability, optimizing its product mix, and transforming from traditional chlor-alkali chemicals toward fine chemicals.