Zhejiang Datuo Printing and Dyeing is located in Shaoxing City, where the printing and dyeing industry is developed. It is mainly engaged in textile dyeing, finishing, printing and dyeing. The 485 communication function of Supmea's pH meter fulfills the requirement of real-time publicity of the pH value and uploading data in the process of printing and dyeing sewage treatment and waste gas treatment in the factory. It is reported that the site has been in operation for one year without any failures, and the site staff reported that it is currently working normally.