STAR Cryoelectronics is a leading worldwide supplier of SQUID sensors and related readout electronics, cryogenic systems, and offers foundry services for superconducting thin-film device fabrication. They develop, manufacture, and market ultra-sensitive Superconducting QUantum Interference Device (SQUID) sensors based on low- and high-temperature superconductors, PC-based SQUID control electronics, transition edge sensor (TES) and superconducting tunnel junction (STJ) X-ray detectors, cryogen-free adiabatic demagnetization refrigerator (ADR) cryostats, and X-ray spectroscopy systems. Their products cater to applications in biomedical imaging, non-destructive testing of materials, geophysical exploration, and basic research. STAR Cryoelectronics also offers custom SQUID foundry and thin-film microfabrication services, and is the exclusive manufacturer of Mr. SQUID®, an Educational Demonstration System for Superconductivity sold to colleges and universities worldwide.