PTB SQUID Sensor Chip (IMAGE) Physikalisch-Technische Bundesanstalt (PTB) Caption PTB SQUID sensor chip (3 mm x 3 mm) is manufactured similarly to a computer chip in the semiconductor industry. Credit PTB 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.