supply of calibration gas mixture in 0.5 ltr w/c aluminium canister along with fine control needle valvecalibration gas mixture in 0.5 ltr w/c aluminium canister along with fine control needle valve,calibration gas mixture in 0.5 ltr w/c aluminium canister along with fine contr ol needle valve containing: methane: 1000 ppm, ethane: 1000 ppm, ethylene: 1000 ppm, acetyle ne: 1000 ppm, hydrogen: 1000 ppm, carbon dioxide: 5000 ppm, carbon monoxide: 5000 ppm, nitrogen: balance: filling pressure: 20 kg/cm2, make: chemtron/upg/ags/alchemie gases & chemica l pvt. ltd. note: (i) the gas canister no. should be punched clearly on the cylinder and should contain press ure gauge on the canister to show internal pressure of the canister. (ii) calibration certificate should be giv en by any govt. accredited laboratory and canister no. should be mentioned on the calibration certificate. [ warranty period: 30 months after the date of delivery ] ]