Upgrade your charging experience with our Multifunctional USB-C Power Meter. This USB tester accurately detects voltage, current, capacity, electrical quantity, power, temperature, resistance, and charging time for your USB or Type-C devices. It's an essential tool for checking the charging performance (speed and quality) of your wall, car, or solar chargers, as well as USB charging cables. You can also use it to test the capacity and energy of your power bank. Voltage Measurement: 4-30V Featuring the latest upgraded IPS color screen with 8 interfaces, you can easily switch between display screens with a simple button press. The larger fonts in one mode allow for at-a-glance data reading. This instrument monitors voltage, current, capacity, electrical quantity, power, load resistance, and more. Test your power bank capacity: Fully charge your power bank, insert the USB voltage tester, double-click to clear data, then connect your load or mobile phone (continuous discharge required). Ensure the discharge voltage is 5V or 9V. (mAh will be multiplied by 1.35 at 5V discharge voltage and 2.45 at 9V discharge voltage, corresponding to the actual battery capacity). Benefit from professional safety protection: This USB-C tester is equipped with over-voltage, over-current, under-voltage, and low-energy protection. This upgraded USB Type-C tester detects safety and protects your devices from damage, automatically shutting off the output while saving data during sudden power outages.