Trace gas sensors (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption The trace gas sensors measure methane, methane isotopes, tracers such as ethane, windspeed, and GPS coordinates. Credit Jeremy Snyder/Berkeley Lab Usage Restrictions N/A License Original content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.