supply of calibration gas mixture in 0.5 ltr w/c aluminium canister with flow control needle valve, septum,pressure gauge and gas drawing valve, containing ;- methane : 1000 ppm vol/vol ,ethane: 1000 ppm vol/vol, ,ethylene : 1000 ppm vol/vol, acetylene: 1000 ppm vol/vol , hydrogen : 1000 ppm vol/vol, carbon dioxide : 5000 ppmvol/vol, carbon monoxide : 5000 ppm vol/vol ,nitrogen : balance. specification: filling pressure: 20kg/cm2,preparation tolerance: +/- 20%, certificate accuracy: +/- 2% stability : 24 months,with calibration test certificatecalibration gas mixture in 0.5 ltr w/c aluminium canister with flow control needle valve, septum,pressure gauge and gas drawing valve, containing ;- methane : 1000 ppm vol/vol ,ethane: 1000 ppm vol/vol, ,ethylene : 1000 ppm vol/vol, acetylene: 1000 ppm vol/vol , hydrogen : 1000 ppm vol/vol, carbon dioxide : 5000 ppmvol/vol, carbon monoxide : 5000 ppm vol/vol ,nitrogen : balance. specification: filling pressure: 20kg/cm2,preparation tolerance: +/- 20%, certificate accuracy: +/- 2% stability : 24 months,with calibration test certificate,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 vo l/vol, ,ethylene : 1000 ppm vol/vol, acetylene: 1000 ppm vol/vol , hydrogen : 1000 ppm vol/vol, carbon dio xide : 5000 ppmvol/vol, carbon monoxide : 5000 ppm vol/vol ,nitrogen : balance. specification: filling pres sure: 20kg/cm2,preparation tolerance: +/- 20%, certificate accuracy: +/- 2% stability : 24 months,with cali bration test certificate [ warranty period: 30 months after the date of delivery ] ] => limited