98L21508593000 is a precision aviation maintenance tool compliant with AS9100D quality standards and FAA/EASA regulations, dedicated to aircraft engine combustion chamber and exhaust system maintenance.It functions as a high-precision thermal barrier coating (TBC) inspection probe, specialized in detecting coating integrity of combustion liners and exhaust components during MRO checks. It accurately identifies coating cracks, peeling or thickness loss, avoids thermal damage to base materials caused by defective TBC, prevents component overheating and deformation under extreme high temperatures, and ensures structural integrity of high-temperature engine sections.Made of high-strength heat-resistant stainless steel with precision sensing tips, it resists high heat and corrosion, working stably at -55℃ to 360℃. Weighing 0.32kg, its slim, flexible design fits confined engine spaces, with high detection sensitivity for reliable testing. It is a critical tool to ensure hot-section component safety and overall engine operational reliability and service life.