Tuning Fork (IMAGE) Graz University of Technology Caption At the Institute for Electronic Sensor Systems a tuning fork was developed, which can measure air compositions. Credit © Lunghammer -- TU Graz Usage Restrictions None License Licensed 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.