supply of calibration gas mixture in 0.5 ltr , calibration gas mixture in 0.5 ltr w/c aluminium canister with flow control needle valve, sept um, pressure gauge and gas drawing valve, containing methane 1000 ppm vol/vol ethane: 1000 ppm vol/v ol. ethylene: 1000 ppm vol/vol. acetylene: 1000 ppm vol/vol, hydrogen: 1000 ppm vol/vol, carbon dioxide: 5000 pm vol/vol, carbon monoxide: 5000 ppm vol/vol,nitrogen: balance. specification: filling pressure: 20k g/cm2. preparation tolerance: +/- 20%, certificate accuracy: +/- 2% stability: 24 months, hsn code:28042 990 with calibration/test certificate [ warranty period: 30 months after the date of delivery ] ]