Easy to use: This USB voltage tester provides real-time voltage, current, power, and other data at a glance. Compact, portable, and requires no extra power, making it suitable for most applications such as mobile phones, power banks, tablets, and other electronic products. Basic parameters: This USB voltage tester and current meter uses exquisite SMAT technology and is compatible with QC2.0 / QC3.0 fast charging tests. Capacity accumulation range: 0-9999mAh, power measurement range: 0-90W. Measurement range: Voltage measurement range 3.2-10V, current measurement range 0-3A. Professionally manufactured to strict factory specifications with a perfect size and rigorously controlled parts. Excellent durability: The shell of this USB power meter is made of high-quality ABS material, offering good wear resistance, high-temperature resistance, and transparency. Ensures maximum strength and durability for a longer lifespan.