Water meter and accessory BIS certifications guarantee accuracy and quality compliance with Indian Standards (IS). Water meters have to be IS 779:1994 (domestic meters), IS 2373:1981 (industrial meters), IS 4927:2003 (hot water meters), and IS 6784: 1996 (electromagnetic meters). Applications on the BIS portal, factory inspection, product testing in a BIS-approved lab, and compliance verification comprise the certification process. Approved manufacturers get the ISI mark authorization for their goods. Samples tested and regular audits guarantee ongoing compliance. Selling water meters in India requires the three to six months of certification process. It improve marketability, consumer confidence, and product dependability. Annually renewal is needed to keep certification validity.