# Multimeter Unit UT-139S — handheld digital multimeter for voltage, current, resistance measurement

**URL:** https://aio.lv/en/product--unit-ut-139s--10490511
**Data updated:** 2026-03-11 11:53 (EET)
**Category:** Measuring tools
**Manufacturer:** Unit
**Manufacturer code:** UT-139S
**EAN:** 5901890044912
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 74.99 €
**Prices and availability valid until:** 2026-07-27 23:59
**Price without VAT (21%):** 61.98 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--unit-ut-139s--10490511

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 17.07.2026 | free |
| Pickup points | 22.07.2026 | 1.89 EUR |
| Courier delivery to door | 22.07.2026 | 4.99 EUR |

## Summary description

Handheld digital multimeter Unit UT-139S for measuring electrical parameters such as voltage, current and resistance. Designed for general electrical troubleshooting, maintenance and DIY tasks, it offers basic multimeter functions in a compact form factor. Suitable for electricians, technicians and hobbyists for diagnostics and routine measurements.

## Long description

The Unit UT-139S is a handheld digital multimeter designed for measuring basic electrical parameters such as voltage, current and resistance. Compact and lightweight, it provides essential functions for general electrical troubleshooting, routine maintenance and DIY electronics work. The instrument is intended to be portable and easy to operate for electricians, technicians and hobbyists who need dependable measurements in the field or workshop.
Advantages
The multimeter offers a clear digital display and a simple rotary selector for quick range selection, delivering straightforward operation without complex menus. Its compact housing and ergonomic shape make it convenient to hold during on-site measurements. The device provides the fundamental measurement modes needed for everyday diagnostics, allowing users to verify circuit voltages, continuity and basic current draw with a single tool.
Suitable for
General electrical troubleshooting in residential and light commercial installations
Routine maintenance and inspection of electrical equipment
Hobby electronics projects and component testing
Field checks by technicians and on-site service personnel
Key specifications
Measurement functions: AC/DC voltage, DC current, resistance, continuity
Display: digital numeric display for measured values
Input protection: basic overload protection on common ranges
Power: battery-powered for portable use
Form factor: handheld, lightweight enclosure with rotary range selector
How to use
Before use, ensure the correct battery is installed and the test leads are in good condition. Select the required measurement function and range using the rotary selector, and connect the test leads to the circuit or component under test following standard safety practices. For voltage measurements, place the probes across the circuit points; for current, connect the meter in series where applicable; for resistance and continuity, measure with power removed from the circuit. Read the value from the digital display and switch the meter off after measurements are complete to conserve battery life.
Usage recommendations
Use insulated test leads rated for the expected voltage and observe basic electrical safety: de-energize circuits when measuring resistance, avoid contact with live conductors when possible, and store the meter in a dry environment. Regularly check batteries and fuse condition to maintain reliable operation.

## FAQ

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

The price is 74.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 100 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 17.07.2026 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, Installment. All transactions are 100% secure and encrypted.

### Can Multimeter Unit UT-139S be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### 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/10490511/52588235_large.webp