Some common tools and techniques used in commissioning a refrigeration system include data loggers, thermocouples, and pressure gauges, which are used to measure and verify system performance and operating conditions. Additionally, commissioning professionals may use software tools, such as building information modeling (BIM) and computer-aided design (CAD), to review and verify system design and layout. Other techniques may include functional performance testing, which involves testing individual components and systems to ensure they are operating correctly, and trend analysis, which involves analyzing data over time to identify patterns and trends in system performance.