Test gas in reusable cylinder "Ecomini" with 2.2 vol% methane (CH4) 25 ppm hydrogen sulphide (H2S) 150 ppm carbon monoxide (CO) 2.5 vol% carbon dioxide (CO2) 15 vol% oxygen in nitrogen (N2). 0.85 litre cylinder size at 70 bar Volume: approx. 60 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.