# Multimeter Unit UT139C CATIII with frequency and temperature measurement

**URL:** https://aio.lv/en/product--unit-ut139c--11274954
**Data updated:** 2026-04-26 18:25 (EEST)
**Category:** Measuring tools
**Manufacturer:** Unit
**Manufacturer code:** UT139C
**EAN:** 6935750531396
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 47.99 €
**Prices and availability valid until:** 2026-07-08 23:59
**Price without VAT (21%):** 39.66 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--unit-ut139c--11274954

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 22.06.2026 | free |
| Pickup points | 29.06.2026 | 1.99 EUR |
| Courier delivery to door | 29.06.2026 | 4.99 EUR |

## Summary description

Digital multimeter Unit UT139C CATIII provides electrical measurements including voltage, current, resistance, plus frequency and temperature measurement. Designed for general electrical troubleshooting, maintenance and testing, it supports safe CATIII-rated use in building installations. Useful for electricians and technicians who need a compact handheld instrument for diagnostics and verification.

## Long description

Unit UT139C CATIII is a handheld digital multimeter that measures AC/DC voltage, AC/DC current, resistance, continuity and diode checks, plus frequency and temperature. The meter is designed for general electrical troubleshooting, installation verification and routine maintenance. Its CAT III safety rating makes it suitable for many building and fixed-installation tasks where transient overvoltages may occur.
Advantages
The multimeter offers a compact and lightweight design for carry and single-handed operation, clear numeric display for quick readings, and combined measurement functions including frequency and temperature to reduce the need for separate instruments. Built-in protection and a CAT III safety classification increase user safety when working on distribution circuits and fixed installations.
Suitable for
 Electrical troubleshooting and diagnostics in residential and commercial installations
 Verification of voltages and currents during installation and maintenance
 Measuring signal frequency for motors, inverters and control circuits
 Temperature checks with a compatible temperature probe for component and ambient measurements
 Continuity and diode testing in wiring and electronic assemblies
When it may not be suitable
This compact multimeter is intended for general electrical work and may not be suitable for specialized high-precision laboratory measurements or for tasks that require true RMS accuracy under highly distorted waveforms unless explicitly specified. It is also not intended for direct connection to high-energy industrial mains beyond the CAT III environment or for measuring very high currents without appropriate clamp accessories.
Key specifications
 Measurement functions: AC/DC voltage, AC/DC current, resistance, continuity, diode, frequency, temperature
 Safety rating: CAT III (suitable for building installations and distribution circuits)
 Form factor: handheld, compact design
 Display: digital numeric readout for quick measurements
 Temperature measurement: supports external temperature probe (type and range depend on probe)
How to use
Connect the test leads to the appropriate input terminals and select the required measurement function on the rotary switch. For voltage and current measurements, observe correct polarity and range selection or use auto-ranging if available. Attach a compatible temperature probe to the temperature input for temperature readings. Always ensure the meter and probes are rated for the circuit you are testing, and follow standard safety procedures: de-energize where possible, use personal protective equipment, and keep fingers behind probe guards during live measurements.
What to consider before purchase
 Confirm required measurement functions (frequency and temperature included) match your tasks
 Ensure CAT III safety rating is sufficient for your installation environment
 Check compatibility and availability of temperature probe or accessories if temperature measurement is needed
 Consider required accuracy and whether true RMS is necessary for your signals
Usage recommendations
Use the Unit UT139C CATIII for routine electrical diagnostics, installation verification and field maintenance where a compact multimeter with frequency and temperature functions is needed. Regularly inspect test leads and probe condition, replace batteries as recommended by the manufacturer, and store the instrument in a dry, dust-free environment to maintain reliable performance.

## FAQ

### How much does the Multimeter Unit UT139C CATIII cost, and is it available for purchase?

The price is 47.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 3 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 22.06.2026 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/11274954/63883800_large.webp