supply of calibration gas mixture in 0.5 ltrcalibration gas mixture in 0.5 ltr,calibration gas mixture in 0.5 ltr w/c aluminium canister with flow control needle valv e, septum, pressure gauge and gas drawing valve, containing : methane : 1000 ppm vol/vol ,ethane: 10 00 ppm vol/vol, 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 and nitrogen balance. specifica tion: filling pressure: 20kg/cm2, preparation tolerance: +/- 20%, certificate accuracy: +/- 2% stabilit y/expiry- 24 months from the date of supply, hsn code: 28042990 with calibration certificate. make: sp ancan, chemtron, kshama [ warranty period: 24 months after the date of delivery ] ]