FNB58 USB Tester Voltmeter Ammeter Type C Fast Charge

FNB58 USB Tester Voltmeter Ammeter Type C Fast Charge is a compact, precise tool that helps you measure and monitor USB-C charging performance in real time. Perfect for tech enthusiasts, DIYers, and professionals, it reveals voltage, current, and power on a single digital display, ensuring you get safe, efficient, and reliable charging every time.

With a slim footprint (42 × 13 × 82 mm) and rugged design, you can carry it in a pocket or toolkit while testing USB-C chargers, cables, and devices. It supports wide monitoring ranges: voltage 4–28 V, current up to 7 A, and power up to 120 W, plus D+/D- signaling voltage of 0–3.3 V. The device records energy (0–9999.99 Wh) and capacity (0–9999.99 Ah), helping you estimate battery life and charging efficiency over time. CE certified and powered from a DC supply, it is built to deliver reliable readings for long testing sessions (record time up to 99 days 23:59:59).

Benefits & Tips

• Verify USB-C fast charging performance by monitoring real-time voltage and current to ensure devices and chargers meet expectations.
• Diagnose charging cables and connectors by checking voltage drops and current consistency during a charge.
• Track energy usage for projects or battery packs by reading Wh and Ah, aiding planning and budgeting.

Product specifications

• Model Number: FNB58
• Brand Name: FNIRSICable
• Display Type: Digital
• Dimensions: 42 × 13 × 82 mm
• Monitor voltage: 4–28 V
• Monitor current: 0–7 A
• Monitor power: 0–120 W
• D+/D- voltage: 0–3.3 V
• Energy used: 0–9999.99 Wh
• Capacity: 0–9999.99 Ah
• Record time: 99 days 23:59:59
• Operating Temperature: 0–40°C
• Certification: CE
• Power Supply: DC
• Origin: Mainland China
• Cable resistance: 0–9999.9 Ω
• Load equivalent internal resistance: 0–9999.9 Ω
• Battery Included: No

Package includes:

• Not specified in product data

Warnings & reminders

• Use within the specified ranges: monitor voltage 4–28 V, monitor current 0–7 A, and power up to 120 W.
• Do not expose to water or moisture, and avoid extreme temperatures beyond 0–40°C.
• This device is a measurement tool—do not connect to high-voltage mains or electrical systems outside the defined DC testing scope.

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