Aristek Highpolymer is a company that produces emulsion polymers and synthetic resins. In the production process, the R301 agitator has often experienced overheating, which disrupted the production process and caused damage to the mixer engine motor. Currently, checking the temperature on the Agitator R301 has been done manually using a thermo-gun and often caused the information to be hampered and several times caused the stirrer motor to go off. For this reason, this study designed a tool that could facilitate checking and reporting if there was an increase in engine temperature. This tool utilized an information system using the concept of Web-Based Internet of Things (IoT). The information system was designed using UML, and the temperature reader was designed using Arduino Uno, Max6675 temperature sensor, and GSM SIM 800L module using the Fritzing application. Product design was done using QFD to get the design of the control device according to the customer’s wishes. The research and experiments obtained a machine temperature controller that could provide information directly to decision-makers if an abnormal event occurred in the machine. It could also control the engine temperature so that it increased productivity and decreased maintenance costs for the agitator machine.