The purpose of this study is to design and develop a soil testing device known as TerraGrow using IoT technology that could help farmers test soil properties and recommend the appropriate crops for growing. The soil testing device could measure EC values, soil moisture levels, and soil temperatures to acquire valuable soil information, which could then be interpreted using a mobile or web application. The results obtained were analyzed using mean and percentage to test the accuracy of the soil testing device. The results revealed that the soil testing device TerraGrow could measure and interpret soil properties with greater accuracy and efficiency. The application of IoT technology made it easy for the soil testing device to store data and provide recommendations for growing appropriate crops based on soil quality. The study results showed that the soil testing device TerraGrow could work with greater efficiency and ease compared to traditional methods. The study concluded that the application of TerraGrow has made a significant contribution to modern agricultural practices. The soil testing device could be made even better with suggestions like automatic calibration and solar power.