Bharat Test House (BTH) runs a group of testing, calibration and inspection laboratories at the HSIIDC Industrial Estate in Rai, Sonipat. Its fire-extinguisher line tests portable extinguishers (IS 15683, ISO 7165), wheeled extinguishers (IS 16018), hose couplings and branch pipes (IS 903), first-aid hose reels (IS 884) and landing valves (IS 5290). This sits alongside electrical, telecom, solar, food and materials testing. Its units are recognised by the Bureau of Indian Standards to test smoke detectors to IS 11360 (OSL code 9135626, Lab 1474) and hose reels to IS 884 (OSL code 9168306, Lab 1668), and its site lists NABL accreditation certificates TC-6451, TC-9000 and TC-13278.