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FNIRSI FNB58

FNIRSI FNB58 USB fast charge tester, front and back views on a white background

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standard (wired) version

Monitor voltage:
4 to 28 V
Monitor current:
0 to 7 A
Protocol conversion:
Supports QC2.0 to PD2.0 protocol conversion

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Package details

Model: FNB58 Std.

Standard wired version; PC connection only.

Condition:
Confirm new or reconditioned on the listing
Quantity:
Confirm package quantity on the listing

Important limit: Bottom of the voltage range is 4 V, so low-voltage 3.x V ports read below range

Confirm condition, quantity and included accessories on the retailer’s listing.

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Specifications checked November 5, 2026. Full product details

Understand the whole path

See the power.
Keep the connection.

An inline meter becomes part of your USB connection. Choose the question it needs to answer.

Actual products · maker photographs

Klein Tools ET920 USB Digital Meter (USB-A and USB-C)
Klein ET920ET920
Plugable USB-C Voltage and Amperage Meter (USBC-VAMETER3, 240W EPR)
Plugable USBC-VAMETER3Maker lifestyle photograph
ChargerLAB POWER-Z KM003C USB-C Tester and PD Analyzer
POWER-Z KM003CKM003C
What needs to work through the meter?

Power ≠ data ≠ protocol analysis

Specification diagram: source to inline USB meter to device. Power, data and protocol analysis are independent capabilities.SOURCEINLINE METERDEVICEUSB-CUSB-C

⎓ Power readings: match the voltage range

↔ Data and video: separate capabilities

≋ PD profile readout: check the model

Specification diagram · conceptual paths, with no simulated measurement.

Choose a task to compare the recorded capabilities.

The detail that changes the choice

Choose what it can tell you.

Klein Tools
Klein Tools ET920 USB Digital Meter (USB-A and USB-C)

Choose a measurement

Klein ET920

ET920

An inline USB meter with USB-A and USB-C pass-through that shows voltage, current, charge, energy and calculated resistance, powered by the port it measures.

  • 20 V operating max

Check before buying. Tops out at 20 V: no USB PD EPR (28 V and up), and Klein warns that more than 24 V DC damages it

See the recorded specification
Connectors
USB-A input and output; USB-C input and output (the inputs are on short attached cables, about 4 in / 100 mm)
Voltage
3 to 20 V DC; accuracy ±1% (the manual adds '±2 Bytes')
How it connects
USB-A in to USB-A out, or USB-C in to USB-C out; the two sides can't be used at the same time, and it isn't a USB-C to USB-A adapter

Source record: ET920

Manufacturer specifications recorded by thisMETER. These are not our own measurements. References belong to this product record; a field-by-field source mapping is not claimed.

Connectors
USB-A input and output; USB-C input and output (the inputs are on short attached cables, about 4 in / 100 mm)
Voltage
3 to 20 V DC; accuracy ±1% (the manual adds '±2 Bytes')
How it connects
USB-A in to USB-A out, or USB-C in to USB-C out; the two sides can't be used at the same time, and it isn't a USB-C to USB-A adapter

Record checked 2026-11-02.

Check price on Amazon
Full product details ↗
Plugable
Plugable USB-C Voltage and Amperage Meter (USBC-VAMETER3, 240W EPR)

Choose a measurement

Plugable USBC-VAMETER3

USBC-VAMETER3

A thumb-size inline USB-C meter that shows volts, amps, watts and the direction of current on an OLED screen while passing data, video and USB PD 3.1 EPR power up to 240 W.

  • 50 V operating max
  • 240 W PD

Check before buying. Shows volts, amps, watts and direction only: Plugable lists no energy totals, PD profile readout or e-marker test

See the recorded specification
Operating range
4.5 to 50 V, 50 mA to 6.5 A
USB PD
Passes USB PD 3.1 Extended Power Range (101 to 240 W); ports rated 48 V, 5 A, 240 W
Data and video
Passes USB data (USB 1.1 through 3.1 Gen 2, 10 Gbps) and USB-C Alternate Mode video
Connectors
USB-C plug and USB-C receptacle; works in either direction

Source record: USBC-VAMETER3

Manufacturer specifications recorded by thisMETER. These are not our own measurements. References belong to this product record; a field-by-field source mapping is not claimed.

Operating range
4.5 to 50 V, 50 mA to 6.5 A
USB PD
Passes USB PD 3.1 Extended Power Range (101 to 240 W); ports rated 48 V, 5 A, 240 W
Data and video
Passes USB data (USB 1.1 through 3.1 Gen 2, 10 Gbps) and USB-C Alternate Mode video
Connectors
USB-C plug and USB-C receptacle; works in either direction

Record checked 2026-11-02.

Check price on Amazon
Full product details ↗
ChargerLAB
ChargerLAB POWER-Z KM003C USB-C Tester and PD Analyzer

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POWER-Z KM003C

KM003C

A USB-C power tester and USB PD protocol analyzer rated to 50 V and 6 A (240 W in PD) that reads cable e-markers, lists a charger's power profiles, detects and triggers fast-charge protocols, and logs to PC software.

  • 50 V operating max
  • 240 W PD

Check before buying. No reverse-voltage protection, per ChargerLAB's manual

See the recorded specification
Voltage and current
0 to 50 V and up to 6 A continuous (240 W in USB PD)
Ports
USB-C plug (input) and USB-C receptacle (output), each supporting USB4 Gen 3 (bidirectional), plus a separate USB-C HID port for a PC or power supply (driver-free per the manual)
USB PD
Supports PD 3.2 (backward compatible), with SPR AVS added in a tester firmware update and PD 3.2 packet capture added in a PC software update; USB PD protocol analyzer with the PC software
Tests
Voltage and current, capacity and energy, e-marker readout, PDO (power profile) list, fast-charge protocol detection and triggering
Protocols (ChargerLAB's list)
PD 3.1 and 3.2, QC4+, QC5, AFC, FCP, SCP, PE, VFCP, SVOOC, UFCS and others

Source record: KM003C

Manufacturer specifications recorded by thisMETER. These are not our own measurements. References belong to this product record; a field-by-field source mapping is not claimed.

Voltage and current
0 to 50 V and up to 6 A continuous (240 W in USB PD)
Ports
USB-C plug (input) and USB-C receptacle (output), each supporting USB4 Gen 3 (bidirectional), plus a separate USB-C HID port for a PC or power supply (driver-free per the manual)
USB PD
Supports PD 3.2 (backward compatible), with SPR AVS added in a tester firmware update and PD 3.2 packet capture added in a PC software update; USB PD protocol analyzer with the PC software
Tests
Voltage and current, capacity and energy, e-marker readout, PDO (power profile) list, fast-charge protocol detection and triggering
Protocols (ChargerLAB's list)
PD 3.1 and 3.2, QC4+, QC5, AFC, FCP, SCP, PE, VFCP, SVOOC, UFCS and others

Record checked 2026-11-02.

Check price on Amazon
Full product details ↗
Compare all 6 published tools · 3 more
FNIRSI
FNIRSI FNB48P USB Fast Charge Tester

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FNIRSI FNB48P

FNB48P

An inline USB power tester with a 1.77-inch colour TFT-LCD and USB-A, Micro-USB and USB-C ports that measures voltage, current, power, capacity and energy and triggers full fast-charge protocols.

Check before buying. The maker publishes no voltage, current or power ranges and no accuracy figures for the FNB48P on its product page, so those key specs are left out

See the recorded specification

This field is not recorded. Check the exact model’s manufacturer documentation.

Source record: FNB48P

Manufacturer specifications recorded by thisMETER. These are not our own measurements. References belong to this product record; a field-by-field source mapping is not claimed.

Display
1.77-inch TFT-LCD colour screen with gravity-sensor auto-rotation
Measurement engine
Built-in 16-bit ADC, six-digit readouts for voltage, current, power, capacity and energy
Displayed statistics
Real-time min, max and average values
Fast-charge protocols
Auto-detect and manual trigger for QC, FCP/SCP, AFC, PD, VOOC/WARP, SuperVOOC and MTK-PE
PD debugging
Built-in PD listener captures PD communication packets; QC2.0-to-PD2.0 cross-protocol conversion test
Cable diagnostics
Reads E-Marker and DASH cable chip raw data; simulates DASH signals without the original cable
Cable resistance
Differential-pressure method measures cable internal resistance
Waveform recording
Up to 9 hours of voltage, current and D+/D- curves; high-speed sampling for ripple analysis
Energy statistics
10 groups of independent capacity and energy logging; up to 99-day runtime statistics
Battery capacity tool
On-board utility computes actual battery capacity with customizable voltage and conversion-efficiency parameters
Other functions
Real-time onboard device temperature monitoring
Interfaces
Integrated USB-A, Micro-USB and USB-C ports
Firmware
PC-upgradable firmware, per the maker
Certification
CE compliant, per the maker
Versions
FNB48P Std. and FNB48P BT (Bluetooth), sold as separate options on the maker's page
Operating environment
-5 to 40 °C, relative humidity up to 80%, per the maker
Warranty
2-year warranty and lifetime technical support from FNIRSI (maker's page)

Record checked 2026-11-05.

A verified retailer offer is not recorded.

Full product details ↗
FNIRSI
FNIRSI FNB58 USB Fast Charge Tester

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FNIRSI FNB58

FNB58

An inline USB tester with a 2.0-inch colour TFT display and USB-A, Micro-USB and USB-C ports that measures voltage, current, power, capacity and energy and triggers and monitors fast-charge protocols.

  • 140 W PD

Check before buying. Bottom of the voltage range is 4 V, so low-voltage 3.x V ports read below range

See the recorded specification

This field is not recorded. Check the exact model’s manufacturer documentation.

Source record: FNB58

Manufacturer specifications recorded by thisMETER. These are not our own measurements. References belong to this product record; a field-by-field source mapping is not claimed.

Display
2.0-inch full-colour TFT LCD, ultra-wide viewing angle, with gravity-sensor rotation
Monitor voltage
4 to 28 V
Monitor current
0 to 7 A
Monitor power
0 to 140 W
D+/D- voltage
0 to 3.3 V
Load equivalent internal resistance
0 to 9999.9 Ω
Capacity
0 to 9999.99 Ah, in 10 switchable groups
Energy used
0 to 9999.99 Wh
Cable resistance
0 to 9999.9 Ω, measured by the differential-pressure method
Running and record time
Up to 99 days 23:59:59
Display resolution
Up to six digits for voltage, current and power
Measurement engine
External 16-bit ADC and a PD protocol physical chip
Sampling
Low-speed waveform drawing at 2 to 100 sps; high-speed ripple drawing at up to 4 M sps
Protocol conversion
Supports QC2.0 to PD2.0 protocol conversion
Cable diagnostics
E-Marker cable chip reading, DASH cable data reading and DASH cable simulation
Other functions
Onboard temperature measurement, PD monitor, record of startup time
Interfaces
Integrated USB-A, Micro-USB and USB-C
Versions
FNB58 Std. and FNB58 BT (Bluetooth), sold as separate options on the maker's page
Operating environment
-5 to 40 °C, relative humidity up to 80%, per the maker
Warranty
2-year warranty and lifetime technical support from FNIRSI (maker's page)

Record checked 2026-11-05.

A verified retailer offer is not recorded.

Full product details ↗
POWER-Z (ChargerLAB)
POWER-Z (ChargerLAB) ChargerLAB POWER-Z SINK240 USB PD3.1 Trigger Board

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POWER-Z (ChargerLAB) SINK240

SINK240

A bare-PCB USB-C trigger and breakout board that requests any USB PD3.1 voltage profile (SPR and EPR up to 48 V, 240 W) or PPS mode from a PD source and presents it on Type-C and screw-down VBUS/GND terminals for test loads.

  • 240 W PD

Check before buying. A trigger/breakout board only: no display and no voltage, current or power readout; verification needs a separate meter or electronic load

See the recorded specification
Connectors
USB-C input, USB-C output, plus positive (VBUS) and negative (GND) wire-loop terminals on the output side for connecting a test load

Source record: SINK240

Manufacturer specifications recorded by thisMETER. These are not our own measurements. References belong to this product record; a field-by-field source mapping is not claimed.

Connectors
USB-C input, USB-C output, plus positive (VBUS) and negative (GND) wire-loop terminals on the output side for connecting a test load

Record checked 2026-11-05.

Check price on Amazon
Full product details ↗

The trap behind the watts

A live wattage isn’t a PD-profile list.

PDOs describe offered power profiles. E-markers describe declared cable capability. Neither is a file-transfer benchmark. Protocol analysis and long logs may need separate host software.

Maker specifications, not our own measurements. Read the exact model’s manual before use.

FNIRSI FNB58 USB Fast Charge Tester

An inline USB tester with a 2.0-inch colour TFT display and USB-A, Micro-USB and USB-C ports that measures voltage, current, power, capacity and energy and triggers and monitors fast-charge protocols.

Which version should you buy?

Selected package: standard (wired) version.

Selected package

  • FNB58 Std.

    This page

    Model: FNB58 Std.

    What differs
    Standard wired version; PC connection only.
    Best for
    Buyers who only need on-screen and PC-connected readings.

Related models and generations

These are different products. Check their specifications separately.

  • FNB58 BT (Bluetooth) Model: FNB58 BT

    Adds Bluetooth so the companion app can log and control the tester remotely; otherwise the same functions.

    Buyers who want app-based logging and remote control.

Purchase links appear where the exact offer is verified. Confirm the named model, quantity and accessories before ordering.

Watch out

  • Both versions look nearly identical: the Bluetooth version is marked BT in the maker's option list.

Why people pick it

  • Measures up to 140 W, 28 V and 7 A per the maker's specification, covering high-power USB-C chargers
  • Triggers and auto-monitors a very wide set of fast-charge protocols, including PD, QC, FCP/SCP, AFC, VOOC/WARP and Super VOOC
  • External 16-bit ADC with a six-digit readout and 10 groups of capacity and energy logging for long tests
  • Reads E-Marker and DASH cable chips and measures cable resistance, so it can grade cables, not just chargers
  • High-speed ripple sampling up to 4 M sps, unusual at this price class, per the maker's spec

Know before you buy

  • Bottom of the voltage range is 4 V, so low-voltage 3.x V ports read below range
  • The maker publishes no overall accuracy figure for voltage, current or power on the product page
  • No paper manual in the box: the manual, firmware and PC software must be downloaded from FNIRSI's site
  • Bluetooth is a separate version (FNB58 BT), not a feature of the standard model

Full specifications

Display2.0-inch full-colour TFT LCD, ultra-wide viewing angle, with gravity-sensor rotation
Monitor voltage4 to 28 V
Monitor current0 to 7 A
Monitor power0 to 140 W
D+/D- voltage0 to 3.3 V
Load equivalent internal resistance0 to 9999.9 Ω
Capacity0 to 9999.99 Ah, in 10 switchable groups
Energy used0 to 9999.99 Wh
Cable resistance0 to 9999.9 Ω, measured by the differential-pressure method
Running and record timeUp to 99 days 23:59:59
Display resolutionUp to six digits for voltage, current and power
Measurement engineExternal 16-bit ADC and a PD protocol physical chip
SamplingLow-speed waveform drawing at 2 to 100 sps; high-speed ripple drawing at up to 4 M sps
Protocol conversionSupports QC2.0 to PD2.0 protocol conversion
Cable diagnosticsE-Marker cable chip reading, DASH cable data reading and DASH cable simulation
Other functionsOnboard temperature measurement, PD monitor, record of startup time
InterfacesIntegrated USB-A, Micro-USB and USB-C
VersionsFNB58 Std. and FNB58 BT (Bluetooth), sold as separate options on the maker's page
Operating environment-5 to 40 °C, relative humidity up to 80%, per the maker
Warranty2-year warranty and lifetime technical support from FNIRSI (maker's page)

From manufacturer documentation, checked November 5, 2026. Spotted an error? Tell us.

Alternatives to consider

FNIRSI FNB48P USB Fast Charge Tester

FNIRSI FNB48P

Specifications & conditions
Protocols decoded
QC, FCP/SCP, AFC, PD, VOOC/WARP, SuperVOOC, MTK-PE (trigger and auto-detect)

An inline USB power tester with a 1.77-inch colour TFT-LCD and USB-A, Micro-USB and USB-C ports that measures voltage, current, power, capacity and energy and triggers full fast-charge protocols.

Check package and model options

  • USB-C chargers
  • Electronics
  • Budget
Find on AmazonDetailsCompare
ChargerLAB POWER-Z KM003C USB-C Tester and PD Analyzer

ChargerLAB KM003C

Max voltage
50 V
Max power
240 W
Specifications & conditions
Max current
6 A
Protocols decoded
USB PD 3.2 (EPR, AVS), QC4+, QC5, AFC, FCP, SCP, PE, UFCS and more

A USB-C power tester and USB PD protocol analyzer rated to 50 V and 6 A (240 W in PD) that reads cable e-markers, lists a charger's power profiles, detects and triggers fast-charge protocols, and logs to PC software.

Check package and model options

  • USB-C chargers
  • Electronics
  • Pros
Check price on AmazonDetailsCompare
POWER-Z (ChargerLAB) ChargerLAB POWER-Z SINK240 USB PD3.1 Trigger Board

POWER-Z (ChargerLAB) SINK240

Max voltage
48 V
Max power
240 W
Specifications & conditions
Max current
5 A
Protocols decoded
USB PD 3.1 (SPR and EPR), PPS (3.3-21 V), AVS LED reserved (currently unused)

A bare-PCB USB-C trigger and breakout board that requests any USB PD3.1 voltage profile (SPR and EPR up to 48 V, 240 W) or PPS mode from a PD source and presents it on Type-C and screw-down VBUS/GND terminals for test loads.

Check package and model options

  • USB-C chargers
  • Electronics
  • Pros
Check price on AmazonDetailsCompare