The STARCHECK by PTW is a high-resolution array detector designed for fast and comprehensive quality assurance (QA) of linear accelerators (Linacs). It features 527 ionization chambers (707 in the STARCHECK maxi) and provides real-time beam scanning without the need for water tank measurements. This CE-marked, class IIb certified device supports a wide range of TG-142 tests and ensures precise, high-resolution measurements for various field sizes, making it an essential tool for radiotherapy QA.