FNIRSI FNB58 is an advanced USB port and fast-charging tester that gives you full control over charging – it measures voltage, current and power in real time, displays graphs, reveals the quality of both the charger and the cable, and verifies protocol compatibility including PD 3.1 (EPR). It’s ideal for accessory diagnostics, service work, and demanding users who want safe and efficient charging.
FNIRSI FNB58 is a measuring tool for detailed analysis of modern USB charging – from common chargers to the latest standards. With support for PD 3.1 (EPR AVS up to 28 V) and detection of PD E-Marker cables up to 240 W, you can easily verify whether your adapter and cable can actually deliver the rated power.
A clear 2.0" LCD display with fine measurement resolution down to 0.0001 lets you instantly spot deviations and instability during charging. The tester shows live voltage and current curves and also supports offline logging for up to 9 hours for later analysis of the entire charging process.
The device is also designed for practical accessory diagnostics and safety:
- Automatic protocol detection (PD, PPS, QC, VOOC and more) for quick verification of the charging mode
- Power ripple measurement to assess charger quality and identify risky power sources
- Cable diagnostics (PD E-Marker, DASH) and verification of real parameters
- Wide port connectivity (USB-A/USB-C/Micro USB) for universal use
Specifications
- Manufacturer
- FNIRSI
- Model
- FNB58
- Color
- Black
- 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 and output, high-current 5P), USB-C (input), USB-C (output), Micro USB (input), PC interface
- USB-C port construction
- 24-pin copper contacts
- Measurement functions
- Real-time voltage, current, power
- Power ripple measurement
- Fast charger quality analysis
- Curve display
- Real-time voltage and current
- Offline curve logging
- Up to 9 hours
- Data logging
- Up to 10 sets of charging and discharging power data
- Battery capacity calculation
- Built-in calculation algorithm
