A digital voltage meter is a device used to measure voltage, displaying the measurement results digitally. Compared with traditional analog voltmeters, digital voltmeters offer higher accuracy, faster response times, and improved readability. In various fields, such as power, electronics, communications, and scientific research, digital voltmeters are extensively employed. In the power system, digital voltmeters are used to monitor the stability of grid voltage; in electronic manufacturing and maintenance, they are used to test and diagnose voltage issues on circuit boards; and in the field of communications, they are used to measure and analyze signal level changes. Digital voltmeters are powerful and user-friendly tools that provide accurate and reliable voltage measurement data.