98D07203003040 is a professional aviation ground support tool compliant with AS9100D standards and FAA/EASA regulations, dedicated to aircraft hydraulic system maintenance and ground debugging. It acts as a high-precision hydraulic pressure test gauge, specialized in detecting pressure of landing gear, flight control and engine hydraulic circuits during MRO, avoiding overload or under-pressure faults. Adopting high-sensitivity sensors, it delivers accurate readings with minimal error and real-time clear display for instant monitoring. Made of high-strength alloy steel with anti-corrosion coating, it resists oil erosion and impact, working stably at -40℃ to 120℃ under high pressure without leakage. Compact at 0.75kg, it has standardized quick connectors for easy installation. It ensures hydraulic system stability, safeguards key actuation components, and is an essential GSE for safe aircraft hydraulic maintenance.