98D07103000000/10 is a precision aviation maintenance tool, compliant with AS9100D quality standards and FAA/EASA maintenance regulations, designed for the environmental control systems (ECS) of large commercial aircraft.

It functions as a cabin temperature sensor calibration tool, used to verify and adjust the accuracy of cabin temperature sensors during MRO maintenance. It provides a stable, precise reference temperature, helping maintenance personnel confirm that the sensor can correctly detect cabin air temperature, avoiding incorrect temperature signals that would cause the ECS to deliver improper heating or cooling, affect passenger comfort, or disrupt avionics thermal management.

Made from high-thermal-conductivity, corrosion-resistant copper alloy, it works stably at -50°C to 200°C, and resists wear. Weighing 0.29kg, it has a clear temperature display, a critical tool for ECS maintenance accuracy.