Our Decade Resistance Box is designed to provide precise and stable simulation of RTD and other resistance-based sensor inputs used in PLC analog input modules. Instead of connecting actual field sensors, engineers can set accurate resistance values directly on the box to replicate real temperature conditions. This makes it easier to validate input scaling, check signal linearity, and confirm that the PLC is interpreting sensor data correctly. By supplying adjustable and repeatable resistance values, the system allows detailed verification of temperature mapping (for example, PT100 input ranges), analog signal accuracy, and system response under different operating points. Engineers can test low, mid, and high range values to ensure consistent measurement performance across the entire span. This solution is highly useful during control panel testing, factory acceptance testing (FAT), site commissioning, and routine maintenance validation. It helps confirm correct PLC logic execution, accurate HMI/SCADA display readings, proper alarm triggering, and stable communication within the automation system.