# Uni-T UT658B USB Tester for Voltage and Current Monitoring

**URL:** https://aio.lv/en/product--unit-ut658b--12478404
**Data updated:** 2026-05-22 07:21 (EEST)
**Category:** Electronics Accessories
**Manufacturer:** Unit
**Manufacturer code:** UT658B
**EAN:** 6935750565827
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 12.99 €
**Prices and availability valid until:** 2026-07-04 23:59
**Price without VAT (21%):** 10.74 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--unit-ut658b--12478404

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 18.06.2026 | free |
| Pickup points | 25.06.2026 | 1.99 EUR |
| Courier delivery to door | 25.06.2026 | 4.99 EUR |

## Summary description

The Uni-T UT658B is a professional USB tester designed to monitor voltage, current, and capacity of USB devices. It provides accurate real-time data for troubleshooting charging issues, testing power banks, and verifying the performance of USB cables and chargers. Featuring a clear display, this compact tool is essential for electronics enthusiasts and technicians needing reliable power diagnostics for various USB-powered hardware.

## Long description

The Uni-T UT658B USB tester is a professional-grade diagnostic tool engineered to monitor voltage, current, and capacity for various USB-powered devices. This compact device provides accurate, real-time data, making it an essential instrument for troubleshooting charging issues, evaluating the performance of power banks, and verifying the quality of USB cables and chargers. Its intuitive design ensures that users can quickly assess power delivery status without complex configurations.
Advantages
The primary benefit of the Uni-T UT658B is its ability to display critical charging parameters simultaneously on a clear LCD screen, eliminating the need to toggle between different measurement modes. The device features integrated data memory capable of storing up to 10 sets of readings, which is highly beneficial for comparative analysis. Its lightweight and portable construction allows for easy transport, while the robust build quality ensures reliable performance during routine electronics maintenance and diagnostic tasks.
Suitable for
Troubleshooting faulty USB chargers and power adapters
Testing the actual capacity of power banks
Verifying the data transfer and charging quality of USB cables
Monitoring real-time power consumption of USB-powered hardware
General electronics diagnostics and hobbyist projects
When it may not be suitable
This tester is designed for standard USB interfaces and may not be compatible with high-power delivery standards or proprietary fast-charging protocols that exceed its specified voltage and current ranges. It is not intended for industrial-grade high-voltage testing or applications requiring data logging beyond its internal memory capacity.
Key specifications
Voltage range: 3 to 9 V
Voltage resolution: 0.01 V
Current range: 0 to 3.5 A
Current resolution: 0.01 A
Capacity range: 0 to 9999 mAh
Data memory: 10 sets
Display type: LCD
Cable length: 10 cm
Operating temperature: -10°C to 40°C
Dimensions: 72 x 29 x 12 mm
Weight: 30 g
How to use
To use the Uni-T UT658B, simply connect the tester directly to a USB power source or insert it between the power source and the device being tested using the integrated cable. Once connected, the LCD screen will automatically activate and display the real-time voltage and current values. You can utilize the internal memory functions to save specific measurements for later review. Ensure that the connected devices do not exceed the specified voltage and current limits to prevent damage to the tester.
What to consider before purchase
Verify that your devices operate within the 3-9V and 0-3.5A range
Ensure the USB connector type matches your hardware requirements
Consider if you need advanced data logging features beyond the 10-set memory capacity
Usage recommendations: Always inspect the USB ports for physical damage before connecting the tester to ensure a secure and safe electrical connection. Avoid exposing the device to high humidity or extreme temperatures outside the specified operating range to maintain measurement accuracy.

## FAQ

### How much does the Uni-T UT658B USB Tester cost, and is it available for purchase?

The price is 12.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 108 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 18.06.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All Unit products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized Unit service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/12478404/68799325_large.webp