The SZ-E300 excavator onboard weighing system is a fully upgraded iteration of the legacy SZ-E02 model. It undergoes comprehensive hardware and software overhauls tailored for harsh open-pit, quarry and bulk material handling scenarios. Optimized high-precision hydraulic pressure sensors and anti-interference circuit hardware boost its weighing range and long-term stability against vibration and dust onsite. The upgraded embedded algorithm cuts dynamic response latency drastically, delivering steady weighing accuracy even during continuous excavator bucket lifting and swinging. Besides streamlined touchscreen-based human-machine interaction with simplified one-click calibration, it supports real-time single-bucket and cumulative weight recording, local data storage and overload early warnings. It eliminates repetitive static weighing, cuts onsite loading waiting time and effectively avoids truck overloading risks for efficient site cargo management.