1. product certificate: the fog gun on the construction site should meet the relevant safety standards and technical specifications, and the supplier should be required to provide the product certificate when purchasing to ensure the safety and quality of the products.

2. Product quality assurance: As a kind of mechanical equipment, the fog gun machine on the construction site needs certain quality assurance. Suppliers usually provide product quality guarantees to prove that products have good working performance and reliability in a certain period of time.

3. Product instruction manual: The instruction manual of the fog gun machine on the construction site is an important document provided to users, including product structure, usage, maintenance, etc. When purchasing, you need to ensure that the complete instruction manual is provided at random.

In addition, when purchasing the fog gun on the construction site, we should also pay attention to the qualification and reputation of the supplier to ensure that the supplier with experience and brand recognition is selected. Before purchasing, we can investigate and review suppliers to understand their production capacity, service quality and after-sales support.

It should be noted that the above certificates and qualifications may vary from country to country. When purchasing, specific requirements and review should be carried out according to local regulations and standards.