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Description
FNIRSI FNB38 USB CHARGE TESTRFNIRSI FNB38 Current and Voltage Meter USB Tester QC4+ PD3. 0 2. 0 PPS Fast Charging Protocol Capacity Test with LCD Screen Current and Voltage Meter USB Tester Overview The FNB38 is a portable, user friendly USB tester used to measure and monitor voltage, current, power, and energy capacity during charging, with a 1. 44 inch color LCD screen. It supports multiple interfaces (USB A, Micro USB, Type C), detects various fast charging protocols like PD
FNIRSI FNB38 Current and Voltage Meter USB Tester QC4+ PD3.0 2.0 PPS Fast Charging Protocol Capacity Test with LCD Screen
Current and Voltage Meter USB Tester
Overview
The FNB38 is a portable, user-friendly USB tester used to measure and monitor voltage, current, power, and energy capacity during charging, with a 1.44-inch color LCD screen. It supports multiple interfaces (USB-A, Micro-USB, Type-C), detects various fast-charging protocols like PD and QC, and includes features like data storage, screen flip, and firmware upgrades.
Features
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Multi-Interface Support:Equipped with USB-A, Micro-USB, and Type-C inputs/outputs for broad compatibility.
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High-Definition Display:A 1.44-inch TFT LCD screen provides a clear display of measurements and data.
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Fast Charge Protocol Detection:It can identify and trigger various fast-charging protocols, including PD (Power Delivery).
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Power and Capacity Monitoring:Measures input voltage (4-24V), input current (0-5A), power (0-120W), and stores data on energy capacity.
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Data Storage & Memory:The device can store detected data, allowing for later review of energy capacity and usage.
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Firmware Upgrades:The device supports drive-free PC upgrades, enabling firmware updates for compatibility with new standards.
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User-Friendly Design:Features a simple interface, screen flip function, and Chinese/English language options.
Common Uses
- Testing and verifying the performance of USB chargers, data cables, and power banks.
- Troubleshooting and ensuring the efficiency of charging for mobile phones and other USB devices.
- Monitoring energy consumption and capacity for electronics enthusiasts, DIY projects, and professional use.
Additional Information
| Device | Tester |
| Type | Current and Voltage | USB |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.5 ★★★★★
Based on 19 reviews
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Product Reviews
★★★★★ 5
Good option, especially in warmer weather
Size: 6-10, Color: Black
High quality socks and very durable. Nice touch adding the grip on the back of the ankle so the sock stays up. Size is a true fit to the size of your foot as well.
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Reviewed in the United States on April 17, 2025
★★★★★ 5
Love these socks!
Size: 6-10, Color: White
Comfortable, no show, and most importantly The Do No Slip!!!! I keep coming back to add to my supply because they have become the only sock I wear. I’ve been using them for a couple years now and they hold to great to washing, bleaching and the dryer. Highly recommended.
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Reviewed in the United States on July 24, 2024
★★★★★ 5
The only socks I will buy
Size: 6-10, Color: Halo Gray/Assorted
These are hands down my favorite socks to wear with tennis shoes. Bought my original 6 pack in the store, liked them so much I went buy more and they were gone. These don't slip on your heel like most socks do. Come up high enough on the top of your foot to protect from tongue rubbing (I giggled when I wrote that) and they come in fun colors. Love they are ultra no show and provide padding but people can't see them with shoes on. Five stars!
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Reviewed in the United States on January 12, 2023
★★★★★ 5
Socks
Size: Medium, Color: Black
Amazing socks. Fits Amazing.
I tried to buy the six pack and it wasn’t the same. Thinner material. The 3 pack is great. Would buy again if it comes up.
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Reviewed in the United States on September 16, 2025
★★★★★ 4
Amazing socks but false advertising. They changed them.
Size: Large, Color: Black (6-pairs)
Okay well I have 4 stars because these are the best socks ever, infact, I threw out all my other socks and switched to just these. No show and they never slip. THE PROBLEM NOW, all the pairs I ordered before had a white symbol, and every time I buy more they have the grey and they are not as low show as my others… I wanted to simplify life and have all the same kind, no matching of colors or slightly different shape, but 4 times now I’ve ordered white symbol and gotten thicker longer ones with gray symbols. I’m considering switching all of my socks to the gray…. But the white symbol ones are way better, they don’t show with hey dudes on and gray symbol ones do now. I’m at a loss. Can someone tell me where to buy 100 pairs of white symbol so I never need to buy another sock again in my life?
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Reviewed in the United States on January 24, 2025
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