precision measurement: The RD UM25 USB 2.0 TypeC LCD Voltmeter Ammeter Battery Charge USB Tester provides precise voltage and current readings, enabling accurate monitoring of your devices and helping you verify charging performance and diagnose charging issues. APP communication: The RD UM25 supports APP communication, enabling easy data tracking and management on your smartphone, which simplifies reviewing measurements and trends. Versatile compatibility: This USB Tester works with a wide range of devices and power sources, making it suitable for monitoring battery charge levels across different setups. Clear LCD display: A quality LCD display lets you read voltage and current at a glance, even in lowlight conditions. Practical applications: Test USB chargers and cables to confirm the actual voltage and current delivered to devices. Monitor charging sessions for smartphones, power banks, and other USBpowered devices to observe realtime performance. Diagnose powerrelated issues in DIY USBpowered projects by measuring draw from components and modules.