supply of standard calibration gas canister for dgastandard calibration gas canister for dga,standard calibration gas canister for dga consisting of methane, ethan e,ethylene, acetylene, hydrogen each 1000 ppm, co and co2 each 5000 ppm and nitrog en balance-01 no, each gases 500 ppm - 01 no, each gases 100 ppm -01 no, with septa and knob arrangement to draw sample directly from canister using gc syringe, prepar ation tolerance+/- 20percent and shelf life 12 months. canister capacity 0.5 litres, fi lling pressure 20 kg/sq.cm with test certificate and suitable septum as spares. [ war ranty period: 12 months after the date of delivery ] => limited