This product is a high-precision AC/DC voltage measurement tool used for research and development laboratories, production lines, and on-site maintenance. Dual channel differential input, can directly measure floating ground signals, readable under sunlight, one click switch to night mode, matched with PC software for real-time drawing and report export. Widely used for voltage inspection in lithium battery formation process (μ V level stability); Harmonic analysis of inverter PWM output (with FFT function); Medical equipment leakage current testing (IEC 60601 standard); Verify Kirchhoff's voltage law and observe the capacitance charge discharge curve in teaching experiments.