Test gas in reusable cylinder "Ecomini" with 50 ppm ethane (C2H6) and methane (CH4) 1 vol.% in synthetic air. Approx. 0.85 litre cylinder size at approx. 37 bar Volume: 31.5 litres Please return the empty cylinders to Esders GmbH after use. We will refill them. As a thank you for your contribution to environmental protection, you will receive a free pack of 100 Esders Connect measurements.