This presentation highlights the NRC’s approach to the characterization, testing, and performance evaluation of airborne optical cloud probes deployed on the Convair 580 research aircraft. It examines calibration procedures, operational protocols, environmental influences on measurement quality, and post-flight verification methods used to ensure reliable cloud-particle observations. Recent advances, including high-speed dual-range imaging instruments, are discussed as part of ongoing efforts to improve measurement accuracy, data quality, and atmospheric research and monitoring capabilities.