Abstract: To address the complex operation and insufficient accuracy of on-site non-electrical signal calibration, a handheld calibration device integrating automatic sampling, error correction, and data communication functions has been designed. Detailed analysis was conducted on the system architecture, hardware-software co-design, and key functional implementation. An experimental platform was established to evaluate calibration accuracy, stability, and power consumption. Research results demonstrate that the device possesses outstanding multi-parameter adaptability and high reliability, making it suitable for non-electrical signal calibration scenarios under complex operating conditions.