supply of set of four nos of standard calibration gas mixture for dissolved gas analyzer with regulator nozzle fine control 0.5 litresset of four nos of standard calibration gas mixture for dissolved gas analyzer with regulator nozzle fine control 0.5 litres,set of four nos of standard calibration gas mixture for dissolved gas analyzer with regulator n ozzle fine control 0.5 litres w/c aluminium high pressure canister with fine control needle valve and rubber s eptum and knob arrangement as spares to draw sample directly from canister using gc syringe.preparation to lerance (plus or minus 20 %) and shelf life 12 months. filling pressure 20 kg/sq.cm.gas composition is as follo ws: item 1: hydrogen 5 ppm,, methane 5 ppm,, ethylene 5 ppm,, ethane 5 ppm, acetylene 5 ppm, carbon mon oxide 50 ppm, carbon dioxide 50 ppm, nitrogen as balance.item 2: hydrogen 500 ppm, methane 500 ppm, eth ylene 500 ppm, ethane 500 ppm, acetylene 500 ppm, carbon monoxide 5000 ppm & carbon dioxide 5000 pp m; nitrogen as balance. item 3: hydrogen 700 ppm, methane 700 ppm, ethylene 700 ppm, ethane 700 ppm, a cetylene 700 ppm, carbon monoxide 7000 ppm & carbon dioxide 7000 ppm; nitrogen as balance item 4: hydr ogen 100 ppm, methane 100 ppm,. ethylene 100 ppm, ethane 100 ppm, acetylene 100 ppm, carbon monoxide 1000 ppm & carbon dioxide 1000 ppm; nitrogen as balance. ]