Portable & Practical : Carry this compact USB detector anywhere you go. It's perfect for on-the-go testing and doesn't require an external power source. Wide Application Range : Suitable for tablets, cell phone batteries, power banks, 5V routers, and any other 5V USB digital device, ensuring comprehensive testing capabilities. Accurate Readings : Experience the accuracy of our digital multimeter, designed with a precision algorithm to deliver stable and reliable readings. Durable Design : The high-quality plastic shell is not only strong but also transparent, offering both protection and visibility. Compatibility Advantage : Works seamlessly with USB 2.0, providing support for high current testing and compatibility with QC2.0/QC3.0 for enhanced performance. Our USB Charger Doctor is your go-to solution for quick and accurate power testing. From tablets to power banks, this device is built to handle a wide range of applications, ensuring that you're always in the know about your devices' charging status. Its cycle display feature adds convenience to your daily routine.