YS-4470 MR.YANG High-Precision Touch Screen Display Ammeter and Multimeter Designed For Mobile Phone and Electronics Repair. Multimeter Functions: Measures standard parameters including voltage (V), resistance (Ω), and frequency (Hz).Ammeter Capabilities: Provides ultra-accurate, real-time current monitoring (mA-level) to help identify motherboard leakage, short circuits, and abnormal power draw.Waveform Analysis: Supports real-time display and analysis of frequency waveforms and boot current, which is critical for debugging complex circuitry.DC Power Output: Features a DC output function for providing power directly to equipment during testing.Charging Detection: Includes dedicated ports for monitoring and analyzing battery charging status.PC Connectivity: Supports data export and analysis via a PC connection for more efficient troubleshooting.