FNIRSI FNB58 BT USB port tester with Bluetooth LCD display FNB58 BT

The FNIRSI FNB58 BT is a USB port tester for checking power output, fast-charging protocols and the quality of chargers and cables. Its 2-inch LCD shows voltage, current and power readings with high precision, letting you spot small fluctuations as they happen during charging. Real-time waveform display and up to nine hours of offline curve recording make it possible to review the entire charging process afterwards.

The tester supports PD 2.0 and 3.0, PPS, QC 2.0 and 3.0, FCP, SCP, AFC, and the proprietary protocols of Huawei, Xiaomi, OPPO and Samsung. It detects the protocol automatically and reads the data of PD cables with E-Marker chips, while a two-step method measures the internal resistance of the cable.

Via Bluetooth and the companion app you can monitor readings conveniently, with overvoltage and overcurrent alerts for added safety. Note that this feature is not supported on iOS.