# Digital Multimeter Unit UNI-T UT-139A — AC/DC Voltage and Current Measurement

**URL:** https://aio.lv/en/product--unit-mie0154--11636323
**Data updated:** 2026-02-17 11:02 (EET)
**Category:** Measuring tools
**Manufacturer:** Unit
**Manufacturer code:** MIE0154
**EAN:** 6935750511398
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 38.49 €
**Prices and availability valid until:** 2026-07-16 23:59
**Price without VAT (21%):** 31.81 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--unit-mie0154--11636323

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 03.07.2026 | free |
| Pickup points | 08.07.2026 | 1.99 EUR |
| Courier delivery to door | 08.07.2026 | 4.99 EUR |

## Summary description

The Unit UNI-T UT-139A is a handheld digital multimeter designed for measuring AC and DC voltage and current. It provides basic diagnostic functions for electricians, technicians and DIY users, suitable for troubleshooting circuits, testing power supplies and checking electrical installations. Portable and straightforward, it helps perform accurate everyday measurements.

## Long description

The Unit UNI-T UT-139A is a handheld digital multimeter for measuring AC and DC voltage and current. Designed for everyday electrical diagnostics, it offers essential measurement functions in a compact, portable form factor suited to electricians, technicians and DIY users. The meter supports troubleshooting of circuits, verification of power supplies and basic checks of electrical installations with a straightforward user interface and clear display.
Advantages
The UNI-T UT-139A combines a compact housing with basic measurement accuracy and a simple rotary switch for quick range selection. Its handheld design and intuitive layout make it easy to perform routine tests on-site. The device provides reliable AC and DC voltage and current readings and is built to be portable for field work or home projects.
Suitable for
 Measuring AC and DC voltage in residential and light-commercial systems
 Checking DC and AC current in low to medium-power circuits
 Troubleshooting power supplies and adapters
 Basic continuity checks and simple circuit diagnostics
 DIY electrical maintenance and hobby electronics work
Key specifications
 Measurement functions: AC voltage, DC voltage, AC current, DC current
 Display type: digital numeric display for measurement readout
 Form factor: handheld, portable multimeter
 Control: manual rotary range selection
 Power: battery-powered for field use
How to use
Before use, insert the required battery and verify the test leads are intact and correctly connected to the meter terminals. Select the appropriate measurement function and range using the rotary switch, observe polarity when measuring DC voltage or current, and place the probes on the circuit points to obtain readings. For current measurements, ensure the meter is configured for the expected current range and that connections are made in series with the load when necessary. Follow standard safety precautions and disconnect power when connecting or disconnecting probe leads in potentially hazardous circuits.
Usage recommendations
Use the UT-139A for routine measurements and basic diagnostics; for high-precision or high-voltage work, consult equipment with higher accuracy and appropriate safety ratings. Store the meter in a dry environment, replace batteries when display dimming is observed, and inspect probes regularly for damage.

## FAQ

### How much does the Multimeter Unit UNI-T UT-139A cost, and is it available for purchase?

The price is 38.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 77 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 03.07.2026 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/11636323/67056232_large.webp