FNIRSI FNB58BT vs FNAC-28 USB Tester Which One Should You Choose Malaysia?
FNIRSI FNB58BT vs FNAC-28 USB Tester – Which One Should You Choose Malaysia?
If you are looking for a FNIRSI USB tester, two models you may come across are the FNIRSI FNB58BT and FNIRSI FNAC-28.
Both are designed for testing USB power and charging behaviour, but they are not necessarily aimed at exactly the same type of user.
So, which one should you choose?
The answer depends on whether you mainly need everyday USB power checking or more detailed USB-C and fast-charging troubleshooting.
Why Use a USB Tester?
Modern chargers are no longer as simple as a fixed 5V power supply.
USB-C chargers, power banks and mobile devices may use different combinations of:
USB Power Delivery
PPS
Quick Charge
Other fast-charging protocols
Different voltage profiles
Different USB cables
Because of this, seeing that a charger is switched on does not tell you what is actually happening.
A USB tester allows you to examine the electrical behaviour between the power source and connected device.
FNIRSI FNB58BT – Better for Detailed Troubleshooting
The FNB58BT is particularly interesting for technicians who want more than basic voltage and current readings.
It can be used for applications involving:
USB voltage and current measurement
Power monitoring
Capacity and energy testing
Fast-charging protocol detection
Protocol-related testing
USB-C cable investigation
E-Marker information
Charging behaviour analysis
Bluetooth-supported monitoring
This makes the FNB58BT suitable for users who regularly work with USB chargers, smartphones, power banks and USB-C devices.
FNIRSI FNAC-28 – Another Option for USB Testing
The FNAC-28 is another FNIRSI instrument designed around USB power and charging analysis.
For buyers comparing the two models, the most important question should not simply be:
Which model is newer?
Instead, ask:
What type of USB testing do I actually need?
If your work mainly involves routine checking of chargers and USB-powered equipment, you may not need every advanced diagnostic function available on a more feature-rich tester.
If you regularly troubleshoot USB-C fast charging, however, additional protocol and cable information can become much more valuable.
FNB58BT vs FNAC-28: What Should You Compare?
Before choosing either tester, consider these areas.
1. Voltage and Current Testing
For basic troubleshooting, the first requirement is normally checking:
Voltage (V)
Current (A)
Power (W)
This helps determine how much power the connected device is actually receiving.
For example, if a phone is charging slowly, the reading may immediately show that it is drawing significantly less power than expected.
2. Fast-Charging Protocol Testing
This becomes increasingly important with modern chargers.
A charger may support high output power, but the device will only enter the expected charging mode when the charger, cable and device successfully negotiate a compatible protocol.
For technicians dealing regularly with fast-charging problems, the FNB58BT is particularly attractive because of its protocol-analysis functions.
3. USB-C Cable Testing
Do not automatically blame the charger when charging performance is poor.
The USB cable can be the problem.
A cable may cause:
Voltage drop
Limited charging current
Failure to reach high-power charging
Intermittent charging
Charging instability
This is why a capable USB tester can be useful for repair shops.
You can compare different cables using the same charger and device to identify changes in charging behaviour.
4. E-Marker Checking
Higher-power USB-C systems can involve electronically marked cables.
Being able to inspect E-Marker information can therefore be useful when checking whether a cable is appropriate for a particular USB-C application.
This is more relevant to advanced USB-C troubleshooting than simple voltage/current measurement.
5. Bluetooth Monitoring
The BT in FNB58BT is another reason some users choose this model.
Bluetooth connectivity can be useful when you want to observe measurement information without relying only on the tester's built-in display.
For technicians conducting repeated tests, this can make data observation more convenient.
Which One Is Better for Phone Repair?
For a mobile phone repair shop, the answer depends on the type of jobs you handle.
If customers frequently complain about:
Slow charging
Fast charging not activating
USB-C charging problems
Power-bank problems
Charger compatibility
Cable compatibility
then a tester with stronger diagnostic capabilities can be worthwhile.
The FNB58BT is particularly suitable when you want to investigate the charging system rather than simply measure voltage and current.
Which One Is Better for Charger Testing?
Consider a simple example.
A customer brings in three chargers:
Charger A – 20W
Charger B – 33W
Charger C – 65W
The wattage printed on the casing does not necessarily tell you what each charger will deliver to a particular device.
A USB tester can help examine:
Actual voltage
Actual current
Actual charging power
Protocol behaviour
Charging stability
This makes comparison much more meaningful.
Which One Is Better for USB-C Cable Testing?
If cable troubleshooting is important, choose based on the depth of information you need.
For simple checks, basic electrical measurements may be sufficient.
For more advanced USB-C work involving fast charging, cable capability and E-Marker information, the FNB58BT becomes a stronger option.
Do You Need the FNB58BT?
Choose the FNIRSI FNB58BT if your priority is:
More detailed USB troubleshooting
It is especially relevant for:
Electronics technicians
Mobile phone repair shops
USB-C troubleshooting
Fast-charging analysis
Charger testing
Power-bank testing
Cable comparison
Electronics enthusiasts
The FNAC-28 may be considered when its particular feature set better matches the intended application.
The best choice is therefore not simply based on price.
It should be based on what you need to test.
Don't Choose a USB Tester Based Only on Maximum Wattage
One common mistake is comparing USB testers only by their maximum supported voltage, current or wattage.
These specifications are important, but they are not the whole story.
For troubleshooting, functions such as:
Protocol detection
USB-C information
Cable testing
E-Marker reading
Data monitoring
can be equally important.
A technician should therefore select the tester according to the actual diagnostic work being performed.
FNIRSI FNB58BT and FNAC-28 Malaysia
MTM Precision supplies FNIRSI electronic testing instruments in Malaysia, including USB testing equipment for electronics, maintenance and troubleshooting applications.
Not sure whether to choose FNB58BT or FNAC-28?
Send us your application, charger specification or a photo of the device you need to test. We can help identify the more suitable model.
MTM Precision Sdn Bhd
Showroom & Service Centre:
No. 29-1 & 29-2, Jalan Bandar 18,
Pusat Bandar Puchong,
47160 Puchong, Selangor, Malaysia.
Tel: 03-8080 7172
WhatsApp: +6016-660 7346
Email: mtmpre@yahoo.com
Website: www.mtmpre.com.my
Supply and enquiries available for customers in Selangor, Kuala Lumpur, Johor, Penang, Melaka, Negeri Sembilan, Perak, Pahang, Kelantan, Terengganu, Kedah, Perlis, Sabah and Sarawak.
07 Oct 2026
