supply of standard calibration gas mixture in 0.5 ltr canister along with fine control needle valve containing: me , standard calibration gas mixture in 0.5 ltr canister along with fine control ne edle valve containing: methane: 1000 ppm, ethane: 1000 ppm, ethylene: 1000 ppm, acetylene: 10 00 ppm, hydrogen: 1000 ppm, carbon dioxide: 5000 ppm, carbon monoxide: 5000 ppm, nitrogen: balance: filling pressure: 20 kg/cm2, ,preparation tolerance: +/- 20%, certificate accuracy: +/- 2% sta bility : 24 months make: chemtron/upg/ags/spancan/nucon or similar. note: (i) calibration certificate should be given by any govt. accredited laboratory and canister no. should be mentioned on the calibration certificate. [ warranty period: 30 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]