In this paper, the authors explain about the fault detection system for industrial materials which are used to make machineries and tools. This system uses latest technology of Raspberry Pi and Arduino MCU. This system is based on low power and low cost as compared to present technology. It uses Ultrasonic transducer for testing object to find fault. Raspberry Pi and Arduino MCU are used as Signal Processing Unit (SPU). Data acquisition and signal averaging will done in signal processing unit. It makes such a system which is useful to find fault in materials and tools and also has various types of features to make system reliable and protective.