1. Search through the Internet: use the search engine and enter keywords such as "environmental third-party testing institutions" to find some official website or information platforms of large-scale environmental third-party testing institutions, which have relevant information or contact information about charging prices for easy understanding and consultation.
2. By consulting the local environmental protection department: you can consult the local municipal, district and county environmental protection departments, get to know the local environmental protection third-party testing institutions, and consult relevant testing items and charging standards.
3. By calling the consultation telephone number: contact the customer service telephone number of some large environmental protection third-party testing institutions, consult the relevant testing items and charging standards, and make an understanding and comparison.