supply of standard calibration gas mixture for dissolved gas analyzer , standard calibration gas mixture for dissolved gas analyzer with regulator nozzle fine contr ol 0.5 litres w/c aluminium high pressure canister with fine control needle valve and septum as spares to draw sample directly from canister using gc syringe. preparation tolerance (plus or minus 05-20 %) and sh elf life 12 months. filling pressure 20 kg/sq.cm. gas composition is as follows: hydrogen 1000 ppm, methan e 1000 ppm,. ethylene 1000 ppm, ethane 1000 ppm, acetylene 1000 ppm, carbon monoxide 5000 ppm & carbon dioxide 5000 ppm; nitrogen as balance . complete with takeup valve, pressure regulator, septum. [ warranty period: 12 months after the date of delivery ] ]