supply of set of standard calibration gas canisterset of standard calibration gas canister,set of standard calibration gas canister for dga consisting of (1) methane ,ethane,ethylene, acetylene, hydrogen, co and co2 each 100 ppm and nitrogen balance-0 1 no (2)methane,ethane,ethylene, acetylene, hydrogen, co and co2 each 500ppm balance nitrogen - 01no (3)methane,ethane,ethylene, acetylene, hydrogen, each 1000ppm, co and co2 each 5000 ppm and nitrogen balance -01no. with pressure gauge,septa and knob arr angement to draw sample directly from canister using gc syringe, preparationtoleran ce+/- 20% and self life 12 months. canister capacity 0.5 litres, filling pressure 20 kg/sq. cm with test certificate and suitable septum as spares. [ warranty period: 12 months after the date of delivery ] ] => limited