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Main image of USB Tester, PD/QC, USB-C E-Marker Reader, 28V 7A, USB-A/C | PD2.0/3.0 & QC2.0/3.0, Voltage/Current/Power Monitoring, Real-Time Graphs, Capacity, Ripple, PD Trigger (NO APP/PC Software)

Alt view image 2 of 7 - USB Tester, PD/QC, USB-C E-Marker Reader, 28V 7A, USB-A/C | PD2.0/3.0 & QC2.0/3.0, Voltage/Current/Power Monitoring, Real-Time Graphs, Capacity, Ripple, PD Trigger (NO APP/PC Software)

Alt view image 3 of 7 - USB Tester, PD/QC, USB-C E-Marker Reader, 28V 7A, USB-A/C | PD2.0/3.0 & QC2.0/3.0, Voltage/Current/Power Monitoring, Real-Time Graphs, Capacity, Ripple, PD Trigger (NO APP/PC Software)

Alt view image 4 of 7 - USB Tester, PD/QC, USB-C E-Marker Reader, 28V 7A, USB-A/C | PD2.0/3.0 & QC2.0/3.0, Voltage/Current/Power Monitoring, Real-Time Graphs, Capacity, Ripple, PD Trigger (NO APP/PC Software)

Alt view image 5 of 7 - USB Tester, PD/QC, USB-C E-Marker Reader, 28V 7A, USB-A/C | PD2.0/3.0 & QC2.0/3.0, Voltage/Current/Power Monitoring, Real-Time Graphs, Capacity, Ripple, PD Trigger (NO APP/PC Software)

Alt view image 6 of 7 - USB Tester, PD/QC, USB-C E-Marker Reader, 28V 7A, USB-A/C | PD2.0/3.0 & QC2.0/3.0, Voltage/Current/Power Monitoring, Real-Time Graphs, Capacity, Ripple, PD Trigger (NO APP/PC Software)

Alt view image 7 of 7 - USB Tester, PD/QC, USB-C E-Marker Reader, 28V 7A, USB-A/C | PD2.0/3.0 & QC2.0/3.0, Voltage/Current/Power Monitoring, Real-Time Graphs, Capacity, Ripple, PD Trigger (NO APP/PC Software)

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USB Tester, PD/QC, USB-C E-Marker Reader, 28V 7A, USB-A/C | PD2.0/3.0 & QC2.0/3.0, Voltage/Current/Power Monitoring, Real-Time Graphs, Capacity, Ripple, PD Trigger (NO APP/PC Software)

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LCD Display USB TesterFNIRSI FNB58 has a 2.0-inch TFT LCD display, integrated USB-A, Micro-USB, Type-C interface. It is a USB voltage andcurrent detection meter and a mobile communication terminal fast charging trigger with gravity sensor
Multifunction USB Digital TesterFNB58 uses external 16-bit ADC, PD protocol physical chip. FNB58 USB tester can monitor the voltage, current, power, resistance, capacity, D+/D- voltage etc, it can be used to test the fast charging protocol of chargers
Fast Charge Protocol Trigger DetectionFNB58 supports QC2.0/QC3.0, FCP/SCP, AFC, PD2.0/3.0, VOOC/WARP, Super VOOC 1.0/2.0 trigger. The above protocols all support automatic monitoring. MTK-PE automatic detection. Support QC2.O->PD2.0 protocol conversion
Parameter RecordingThe highest six-digit display of voltage, current and power. 10 sets of switchable capacity, power etc. Support low-speed waveform drawing, 2 sps-100 sps sampling rate. Support high-speed ripple drawing, up to 4 M sps sampling rate
USB tester detection functionThe resistance measurement of the wire by the differential pressure method. E-Marker Cable chip reading. DASH Cable data reading. Record of startup time. Onboard temperature measurement. PD monitor. Analog DASH cable
NoteTo support environmental protection and reduce paper use, the FNB58 does not include a printed manual. You can access the manual, firmware updates, and app information via the QR code provided in the packaging

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FNIRSI Technology Co., Ltd.

Transforming technology into a tool to serve customers

FNIRSI Technology Co., Ltd. is a high-tech enterprise integrating instrumentation independent development, design, production and sales, providing high-quality and cost-effective instrumentation and peripheral tools and equipment for users worldwide.
FNIRSI's equipment has covered the sales market in many countries and regions around the world such as USA, Japan, EU, Canada, etc.
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Take you to see the secrets of electricity in the cable

FNB58 USB tester has a 2.0-inch full-color ultra-wide viewing angle TFT LCD display, integrated USB-A, Micro-USB, Type-C interface.
FNB58 uses external 16-bit ADC, PD protocol physical chip, it can be used to test the fast charging protocol of chargers.
FNB58 can be used to measure the power supply or power consumption of products such as USB interfaces, mobile phone chargers, and U disks.
FNB58 can be used to measure the charging power of mobile phones and the input and output of mobile power supplies.

Four Functional Curve Display

Real-time voltage and current curve

View the change of the charging curve in real time, find the abnormal charging immediately.

Offline curve recording

Supports up to 9 hours of offline voltage and current curve recording, charging process fully displayed.

D+/D- voltage curve

Charging protocols Changes. Master in real time.

High-speed power ripple measurement

Charger ripple measurement, easy to screen inferior chargers.

Cable Detection Just Use FNB58

PD E-Marker Cable Detection

Read data information of CC line with E-Marker chip

DASH Cable Detection

Read DASH cable chip related data

Cable Interal Resistance Measurement

Constant current load two-step fast measurement of wire resistance

	FNB58 USB tester	FNB58 Standard USB tester	FNB48P USB tester	DMT-99 Multimeter	DMC-100 Clamp Meter

Customer Reviews	—	—	—	—	—
Price	—	—	—	—	—
APP software	?	NO	?	NO	V
USB power delivery 3.1/Xiaomi magic change PD	?	?	NO	NO	NO
QC4, QC4+\ QC5, Huawei 66W/240W	?	?	NO	NO	NO
Simulation switch: protocol conversion PC-PD simulation isolation is not damaged	?	?	NO	NO	NO
Monitoring voltage/current/power	4~28V/7A/140W	4~28V/7A/140W	4~24V/6.5A/156W	Non-USB tester	Non-USB tester
High -speed chain display	50K -> 4M Sa/s	50K -> 4M Sa/s	50K -> 3.2M Sa/s	Non-USB tester	Non-USB tester
High -speed ripple bandwidth	400KHz	400KHz	320KHz	Non-USB tester	Non-USB tester
Multimeter Counts	No Multimeter	No Multimeter	No Multimeter	9,999 TRMS	9,999 TRMS
AC/DC Voltage	No Multimeter	No Multimeter	No Multimeter	AC: 750V /DC: 999.9V	AC: 750V /DC: 999.9V
AC/DC Current	No Multimeter	No Multimeter	No Multimeter	AC/DC:9999uA-9.999A	AC/DC:9999uA-9.999A

FNB58 USB tester has a 2.0-inch full-color ultra-wide viewing angle TFT LCD display, integrated USB-A, Micro-USB, Type-C interface.
FNB58 uses external 16-bit ADC, PD protocol physical chip, it can be used to test the fast charging protocol of chargers.
FNB58 can be used to measure the power supply or power consumption of products such as USB interfaces, mobile phone chargers, and U disks.
FNB58 can be used to measure the charging power of mobile phones and the input and output of mobile power supplies.

Four Functional Curve Display

Real-time voltage and current curve

View the change of the charging curve in real time, find the abnormal charging immediately.

Offline curve recording

Supports up to 9 hours of offline voltage and current curve recording, charging process fully displayed.

D+/D- voltage curve

Charging protocols Changes. Master in real time.

High-speed power ripple measurement

Charger ripple measurement, easy to screen inferior chargers.

Cable Detection Just Use FNB58

PD E-Marker Cable Detection

Read data information of CC line with E-Marker chip

DASH Cable Detection

Read DASH cable chip related data

Cable Interal Resistance Measurement

Constant current load two-step fast measurement of wire resistance

	FNB58 USB tester	FNB58 Standard USB tester	FNB48P USB tester	DMT-99 Multimeter	DMC-100 Clamp Meter

Customer Reviews	—	—	—	—	—
Price	—	—	—	—	—
APP software	?	NO	?	NO	V
USB power delivery 3.1/Xiaomi magic change PD	?	?	NO	NO	NO
QC4, QC4+\ QC5, Huawei 66W/240W	?	?	NO	NO	NO
Simulation switch: protocol conversion PC-PD simulation isolation is not damaged	?	?	NO	NO	NO
Monitoring voltage/current/power	4~28V/7A/140W	4~28V/7A/140W	4~24V/6.5A/156W	Non-USB tester	Non-USB tester
High -speed chain display	50K -> 4M Sa/s	50K -> 4M Sa/s	50K -> 3.2M Sa/s	Non-USB tester	Non-USB tester
High -speed ripple bandwidth	400KHz	400KHz	320KHz	Non-USB tester	Non-USB tester
Multimeter Counts	No Multimeter	No Multimeter	No Multimeter	9,999 TRMS	9,999 TRMS
AC/DC Voltage	No Multimeter	No Multimeter	No Multimeter	AC: 750V /DC: 999.9V	AC: 750V /DC: 999.9V
AC/DC Current	No Multimeter	No Multimeter	No Multimeter	AC/DC:9999uA-9.999A	AC/DC:9999uA-9.999A

FNIRSI Technology Co., Ltd.

Transforming technology into a tool to serve customers

FNIRSI Technology Co., Ltd. is a high-tech enterprise integrating instrumentation independent development, design, production and sales, providing high-quality and cost-effective instrumentation and peripheral tools and equipment for users worldwide.
FNIRSI's equipment has covered the sales market in many countries and regions around the world such as USA, Japan, EU, Canada, etc.
New Releases
FNIRSI Oscilloscope
FNIRSI Oscilloscope
Others
Soldering Iron Kit
FNIRSI DSO-510 Oscilloscope
10MHz Bandwidth, 48MS/s Sampling Rate, 2 in 1 Oscilloscope/DDS Signal Generator
FNIRSI DMT-99 Multimeter
9999 Count Digital Multimeter with Recording Mode
FNIRSI 2C53P Oscilloscope
4.3 inch Touch Screen Tablet Oscilloscope Multimeter DDS Signal Generator
FNIRSI 2C23T Plus Oscilloscope
3 IN 1 Digital Oscilloscope Multimeter DDS Generator
FNIRSI GC-01 Geiger Counter
Detect and stay away from radiation sources in life
FNIRSI HRM-10 Battery Tester
Voltage Internal Resistance Battery Meter
FNIRSI USB Power Meter
Take you to see the secrets of electricity in the cable

FNB58 USB tester is a reliability and safety USB voltage andcurrent detection meter and a mobile communication terminal fast chargingtrigger.

It has a 2.0-inch full-color ultra-wide viewing angle TFT LCD display, integrated USB-A, Micro-USB, Type-C interface.

Use external 16-bit ADC, PD protocol physical chip.

It can be used to measure the power supply or power consumption of products such as USB interfaces, mobile phone chargers, and U disks.

It can be used to measure the charging power of mobile phones and the input and output of mobile power supplies.

It can be used to test the fast charging protocol of chargers.

This instruction manual includes relevant safety information, warningtips and solutions to common abnormal situations.

Please read the relevantcontent carefully and strictly abide by all warnings and precautions.

Do not connect the monitoring interface to a power supply exceeding 28V.

Do not connect the PC connection port to a power source exceeding 16v.

Only one pair of monitoring interfaces (one input port,one outputport) can work at the same time. When there is a pair of monitoring interfaces working, it is forbidden to connect to the equipment onother monitoring interfaces. (Except the PC connection port, the PC port can be connected to an external power supply).

When using the fast charge trigger module,please do not connect equipment that cannot withstand high voltage to any monitoring interface.

After using the PD trigger/monitor/conversion/read E-Marker cablefunction, please turn the PD communication switch in the lower rightcorner back to the OFF position.

Do not charge the phone after the fast charge is triggered.

Additional Information
First Listed on Newegg	October 19, 2026

Warranty & Returns

Warranty, Returns, And Additional Information

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Return for replacement within: 30 days
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Item#: 9SIC85SM926053

Meet Your Seller

USB Tester, PD/QC, USB-C E-Marker Reader, 28V 7A, USB-A/C | PD2.0/3.0 & QC2.0/3.0, Voltage/Current/Power Monitoring, Real-Time Graphs, Capacity, Ripple, PD Trigger (NO APP/PC Software)

FNIRSI Technology Co., Ltd.

New Releases

FNIRSI Oscilloscope

FNIRSI Oscilloscope

Others

Soldering Iron Kit

FNIRSI DSO-510 Oscilloscope

FNIRSI DMT-99 Multimeter

FNIRSI 2C53P Oscilloscope

FNIRSI 2C23T Plus Oscilloscope

FNIRSI GC-01 Geiger Counter

FNIRSI HRM-10 Battery Tester

FNIRSI USB Power Meter

Four Functional Curve Display

Real-time voltage and current curve

Offline curve recording

D+/D- voltage curve

High-speed power ripple measurement

Cable Detection Just Use FNB58

PD E-Marker Cable Detection

DASH Cable Detection

Cable Interal Resistance Measurement

Four Functional Curve Display

Real-time voltage and current curve

Offline curve recording

D+/D- voltage curve

High-speed power ripple measurement

Cable Detection Just Use FNB58

PD E-Marker Cable Detection

DASH Cable Detection

Cable Interal Resistance Measurement

FNIRSI Technology Co., Ltd.

New Releases

FNIRSI Oscilloscope

FNIRSI Oscilloscope

Others

Soldering Iron Kit

FNIRSI DSO-510 Oscilloscope

FNIRSI DMT-99 Multimeter

FNIRSI 2C53P Oscilloscope

FNIRSI 2C23T Plus Oscilloscope

FNIRSI GC-01 Geiger Counter

FNIRSI HRM-10 Battery Tester

FNIRSI USB Power Meter

Learn more about the Detailed Specifications

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info