FNIRSI FNB58 BT is an advanced USB port and fast-charging tester that lets you accurately measure voltage, current, and power in real time, verify charging protocol compatibility, and identify weak or potentially dangerous power sources. With Bluetooth, a clear 2" LCD display, and support for PD 3.1 up to 28 V, it’s ideal for checking chargers, cables, and power banks.
FNIRSI FNB58 BT is a measurement and diagnostic tool for anyone who wants full control over charging— from service technicians to demanding users. The device supports modern standards including USB Power Delivery 3.1 (EPR AVS up to 28 V) and can recognize the capabilities of cables with a PD E‑Marker chip up to 240 W. This makes it easy to verify whether your charger and cable really deliver the power they claim.
On the 2.0" LCD display you can see complete measured values with fine 0.0001 resolution, so you can quickly spot even small deviations during charging. Also useful is ripple analysis, which helps assess power-source quality and avoid low-quality chargers that can shorten battery life.
FNB58 BT also displays voltage and current curves in real time and offers offline logging for up to 9 hours for later analysis. Bluetooth connectivity and app support make monitoring data easier and can also provide safety alerts (e.g., overvoltage and overcurrent; note: this feature is not supported on iOS).
- Wide protocol support: PD 2.0/3.0/3.1, PPS, QC 2.0/3.0, FCP, SCP, AFC, PE, DASHVOOC, SuperVOOC
- Compatibility with fast charging from Huawei, Xiaomi, OPPO, Apple, and Samsung
- Cable diagnostics: CC reading (E‑Marker), DASH cable detection, internal resistance measurement
- Rich connectivity: USB-A, USB-C, Micro USB, and PC interface
Specifications
- Manufacturer
- FNIRSI
- Model
- FNB58
- Dimensions
- 42 × 13 × 82 mm
- Display
- 2.0" LCD
- Measurement resolution
- 0.0001
- Fast-charging support
- PD 2.0, PD 3.0, PD 3.1 (EPR AVS up to 28 V)
- Cable detection
- PD E‑Marker (up to 240 W), DASH cables
- Supported charging protocols
- PPS, QC 2.0, QC 3.0, FCP, SCP, AFC, PE, DASHVOOC, SuperVOOC
- Fast-charging compatibility
- Huawei, Xiaomi, OPPO (Super Fast Charge), Apple (Power Delivery), Samsung (Fast Charge)
- Ports and interfaces
- USB-A (input & output, high-current 5P), USB-C (input), USB-C (output), Micro USB (input), PC interface
- USB-C port design
- 24-pin copper contacts
- Measurement functions
- Voltage, current, power in real time
- Power ripple measurement
- Fast-charger quality analysis
- Curve display
- Real-time voltage and current curves
- Offline curve logging
- Up to 9 hours
- Battery capacity calculation
- Built-in calculation algorithm
- Wireless connectivity
- Bluetooth
