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When applying for explosion-proof certification and coal safety certification, customers often ask whether it is necessary to send samples for testing In fact, when most products undergo explosion-proof certification or coal safety certification, a product testing method is employed; that is, the applicant provides 2–3 finished products to the testing agency for evaluation, and upon passing the tests, a test report and certificate are issued. However, what should be done in cases where some products are large in size and difficult to send for inspection? To address this issue, the Safety Standard **Center provided a flexible solution. Catalog of products for on-site inspection: Products subject to on-site inspection are generally those that are too large in size, difficult to transport, or prone to damage during transportation, as well as those that require inspection on-site according to relevant technical regulations. The on-site inspection product catalog is confirmed by the Safety Standard **Center. The products that currently require (can be) subject to on-site inspection mainly include water pumps for coal mines, mobile air compressors for underground use, belt conveyors, scraper conveyors, transfer machines, hoists for coal mines, winches for coal mines, lifting containers (including hoppers and cages), explosion-proof battery-powered locomotives, overhead wired industrial locomotives, explosion-proof diesel locomotives, mine ventilators, water ring vacuum pumps, nitrogen generators, coal cutters, roadheaders, pipe bundling monitoring systems, and gas drainage pumping stations. On-site inspection procedure: The applicant shall first submit an application for an on-site inspection to the Safety Standard ** Center and the testing and inspection agency, including the information in the table below. Upon receiving the application, if the Safety Standard ** Center has the capability to conduct product inspections, it will send inspectors to carry out the on-site inspection.