# Multimeter Unit Uni-T UT139B — handheld digital multimeter, general-purpose measurements

**URL:** https://aio.lv/en/product--unit-mie0155--10456311
**Data updated:** 2026-03-11 11:52 (EET)
**Category:** Measuring tools
**Manufacturer:** Unit
**Manufacturer code:** MIE0155
**EAN:** 5901436796732
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 44.49 €
**Prices and availability valid until:** 2026-07-16 23:59
**Price without VAT (21%):** 36.77 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--unit-mie0155--10456311

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 26.06.2026 | free |
| Pickup points | 01.07.2026 | 1.99 EUR |
| Courier delivery to door | 01.07.2026 | 4.99 EUR |

## Summary description

Handheld digital multimeter Unit Uni-T UT139B for general-purpose electrical measurements. Designed to measure voltage, current and resistance along with continuity checks and diode testing. Suitable for electricians, technicians and hobbyists for troubleshooting circuits, testing components and verifying electrical installations in residential and light commercial use.

## Long description

The Unit Uni-T UT139B is a handheld digital multimeter designed for general-purpose electrical measurements. It measures AC/DC voltage, current and resistance, and includes continuity checks and diode testing. The compact form factor and straightforward interface make the UT139B suitable for field use and bench troubleshooting when working with residential and light commercial electrical circuits.
Advantages
The Unit Uni-T UT139B offers a clear digital display and a rotary selector that provides quick access to common measurement functions. Its compact, lightweight housing makes it easy to carry and operate with one hand. The device supports basic protection features and is intended for routine diagnostics, component testing and verification of installations without requiring complex setup.
Suitable for
Electricians performing basic voltage, current and resistance checks
Technicians troubleshooting power supplies and circuits
Hobbyists testing electronic components and continuity
Inspecting residential and light commercial electrical installations
Key specifications
Measurement functions: AC/DC voltage, AC/DC current, resistance, continuity, diode test
Display type: digital numeric display for readings
Form factor: handheld, portable design suitable for single-handed use
Input terminals: standard test lead connectors for probes
Power: battery powered for field portability
How to use
Turn the rotary selector to the required function and connect the test leads to the appropriate input terminals. For voltage measurements, place the probes across the circuit or component while observing correct polarity for DC measurements. For current measurement, use the proper current range and series connection as required by the measurement type. Use the continuity and diode test modes to check conductors and semiconductor junctions; a tone or visual indication confirms continuity. Observe basic safety practices such as removing power when measuring resistance or continuity on isolated components.
Usage recommendations
Before each use, inspect test leads and the meter housing for damage. Select the highest measurement range if the expected value is unknown, and always follow safety guidelines for working on live circuits. Store the multimeter in a dry environment and replace batteries promptly to ensure accurate readings.

## FAQ

### How much does the Multimeter Unit Uni-T UT139B cost, and is it available for purchase?

The price is 44.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 607 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 26.06.2026 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/10456311/52488458_large.webp