The implementation of IoT has become a standard approach for developing solutions across various industrial automation systems. In supply chain management and logistics, reducing waste and ensuring efficient information flow through real-time monitoring are essential for maintaining smooth and lean operations. This study focuses on two critical components of the supply chain—inventory management and transportation—and presents a flexible temperature and humidity monitoring system capable of both continuous observation and adjustable threshold control based on operational needs. The system integrates an ESP8266 NodeMCU module, a DHT11 temperature and humidity sensor, a GPS module for transportation data, and an I2C LCD for local display. Its primary goal is to prevent losses caused by inadequate environmental oversight and to provide decision-makers with greater authority and responsiveness in managing sensitive goods. As demonstrated through the experimental setup and results, the system delivers real-time data visualization, user-controlled threshold settings via a slider interface, and reliable temperature and humidity streaming. These capabilities make the system adaptable for dynamic logistics environments, offering a practical solution for reducing waste related to improper storage conditions, such as spoiled perishable foods or degraded pharmaceutical products. In future implementations, coupling this monitoring system with HVAC units could further enhance environmental control during both inventory storage and transportation. Moreover, the collected data can support informed decision-making, helping organizations plan proactively and optimize their operations.