The COM-VM01 is an ultra-compact digital voltmeter designed for quick and precise DC voltage measurements in electronic projects, prototypes, and monitoring applications. It features a bright red 3-digit 7-segment display with a digit height of 0.36in, ensuring excellent readability even in low-light environments.The module operates directly from the measured voltage, eliminating the need for an additional power source. It supports a wide measurement range from 3 V to 29.9 V DC with a high input resistance of over 100 k?, providing accurate readings without influencing the circuit under test. The integrated calibration potentiometer allows fine adjustment for optimal accuracy of up to ± 0.1 %.Thanks to its compact dimensions (33 × 15 × 11 mm) and low weight of only 5 g, the COM-VM01 can be easily integrated into enclosures, control panels, or embedded systems. With a refresh rate of 300 ms, it provides fast and stable readings, ideal for voltage monitoring tasks in laboratories, vehicl