The ISI Mark is a certification mark issued by the Bureau of Indian Standards (BIS), the national standards body of India. It indicates that a product conforms to the relevant Indian Standard (IS) and meets quality, safety, and reliability benchmarks.
The ISI Certification is mandatory for several products, especially those that impact public health and safety such as electrical appliances, cement, steel, and packaged drinking water.
https://bis-certifications.com..../a-guide-to-bis-cert

BIS FMCS (Foreign Manufacturers Certification Scheme) is a regulatory framework that enables foreign manufacturers to obtain a BIS license for their products. Under this scheme, manufacturers located outside India can apply for certification and sell their products in the Indian market with the BIS Standard Mark.
The BIS FMCS Certificate confirms that the product complies with relevant Indian Standards (IS). Without this certification, certain products cannot be legally imported, sold, or distributed in India.
https://bis-certifications.com..../a-guide-to-bis-cert

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