STAR Cryoelectronics LLC develops, manufactures and markets ultra-sensitive Superconducting Quantum Interference Device (SQUID) sensors and advanced PC-based SQUID control electronics products. The ultra-sensitive SQUID sensors are based on Low-Temperature Superconductor (LTS) and High-Temperature Superconductor (HTS) technologies. SQUID technology has applications in biomedical imaging, non-destructive testing of materials, geophysical exploration, and basic research. PC-based SQUID control electronics, marketed under the name pcSQUID, offers unsurpassed flexibility and outstanding performance for single and multi-channel applications. In addition to the complete line of advanced SQUID sensor and control electronics products, STAR Cryoelectronics offers custom SQUID foundry and thin-film microfabrication services. STAR is developing a transition edge sensor (TES) and superconducting tunnel junction (STJ) X-ray detectors, cryogen-free adiabatic demagnetization refrigerator (ADR) cryostats, and X-ray spectroscopy systems based on multi-pixel arrays of TES or STJ detectors for X-ray microanalysis in conjunction with a scanning electron microscope (SEM) or X-ray absorption spectroscopy at synchrotron soft X-ray beamlines.