FNB58 USB Tester Voltmeter Ammeter Type C Fast Charge

Meet the FNB58 USB Tester Voltmeter Ammeter Type-C Fast Charge — a compact power meter designed for USB-C charging setups. This digital tester lets you read voltage, current, and energy in real time, so you can verify true fast charging performance, test cables and adapters, and quickly diagnose charging issues. Its small footprint (42 x 13 x 82 mm) makes it a perfect addition to any toolkit, pocketable and ready for on-the-go use.

Key measurements include a voltage range of 4–28V, current monitoring up to 7A, and power up to 120W. It records energy from 0 to 9999.99 Wh and capacity from 0 to 9999.99 Ah, with a digital display for clear, easy readings. The device can record data for up to 99 days, 23:59:59, so you can track long charging sessions. It operates on DC power, has no internal battery (Battery Included: No), and carries model number FNB58. Originating from Mainland China and CE-certified, this tester provides D+/D- voltage measurements from 0 to 3.3V for comprehensive USB-C diagnostics. Whether you’re checking a fast charger’s claims, validating a new USB-C cable, or simply monitoring charging behavior, the FNB58 delivers precise, dependable results you can trust.

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Benefits & Tips

• Verify true USB-C fast charging performance by monitoring voltage, current, and power in real time.
• Test and compare multiple USB-C cables and adapters to identify the best charging setups and protect device batteries.
• Use during DIY projects to observe energy consumption and optimize charging efficiency over time.

Product specifications

• Model Number: FNB58
• Brand: TIANSIQICable
• Display Type: Digital
• Power Supply: DC
• Origin: Mainland China
• Dimensions: 42 × 13 × 82 mm
• Monitor current: 0–7 A
• Monitor voltage: 4–28 V
• Voltage range: 4–28 V (monitoring)
• Voltage on D+/D-: 0–3.3 V
• Energy used: 0–9999.99 Wh
• Capacity: 0–9999.99 Ah
• Record time: 99 days 23:59:59
• Display: Digital
• Battery Included: No
• Certification: CE

Package includes:

• 1 x FNB58 USB Tester Voltmeter Ammeter Type-C Fast Charge

Warnings/Reminders

• Operate within the specified range: voltage 4–28 V and current up to 7 A for accurate readings.
• This is a measurement tool, not a power source.
• Use with proper USB-C power supplies and devices.
• Keep the device within 0–40°C and away from moisture to ensure reliable performance.