When Zoom GlobalMech Corp’s 90 m³/h mobile mixing plant near Phnom Penh suddenly lost batching accuracy, a 30 °C monsoon and a 28-hour concrete pour window left no room for error. The local agent placed an emergency call at 06:00; by 14:00 the same day, two factory technicians boarded a flight from Guangzhou carrying a 45 kg crate of load-cell amplifiers, a PLC backup module and calibrated weights. Remote diagnosis via 4G VPN had already confirmed that moisture ingress—common in 95 % humidity—had corrupted the analog signals, causing cement to over-batch by 4 % and triggering strength-compliance alarms.