Calibration probe (IMAGE) DOE/Argonne National Laboratory Caption Calibration probe inside of the solenoid magnet at Argonne's 4 Tesla Solenoid Facility. Credit (Image by Mark Lopez, Argonne National Laboratory.) 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.