# UNI-T UT278A+ Clamp Earth Ground Tester, 800 Ohm, 20A, 32mm Jaw

**URL:** https://aio.lv/en/product--unit-ut278a--12574813
**Data updated:** 2026-07-09 14:55 (EEST)
**Category:** Other goods
**Manufacturer:** Unit
**Manufacturer code:** UT278A+
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 418.95 €
**Prices and availability valid until:** 2026-08-09 23:59
**Price without VAT (21%):** 346.24 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--unit-ut278a--12574813

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | Wednesday | free |
| Pickup points | 20.07.2026 | 1.89 EUR |
| Courier delivery to door | 20.07.2026 | 4.99 EUR |

## Summary description

The UNI-T UT278A+ is a professional clamp-on earth ground tester designed for precise resistance measurements up to 800 Ohm and current up to 20A. Featuring a 32mm jaw opening, it includes an EBTN LCD display, audible and visual alarms, and an auto power-off function. This reliable tool is ideal for electrical maintenance and grounding system testing in industrial and commercial environments.

## Long description

The UNI-T UT278A+ is a professional-grade clamp-on earth ground tester engineered for high-precision resistance and leakage current measurements. This device allows for the rapid and safe assessment of grounding systems without the need to disconnect ground lines or utilize auxiliary electrodes. Built with a robust double-insulation design, it effectively minimizes environmental interference, making it a reliable choice for demanding industrial and commercial electrical maintenance tasks.
Advantages
This tester stands out due to its ability to perform measurements without interrupting the circuit, which significantly improves workflow efficiency and safety. The integration of an EBTN LCD display ensures excellent visibility in various lighting conditions, while the 32mm jaw opening accommodates a wide range of conductors. With advanced features such as auto-calibration, data storage for up to 300 readings, and simultaneous resistance and current display, users can conduct comprehensive diagnostics with ease. The inclusion of audible and visual alarms provides immediate feedback when measurements exceed set limits, ensuring operational safety.
Suitable for
Industrial grounding system maintenance
Commercial electrical infrastructure testing
Leakage current monitoring in power distribution
Routine electrical safety inspections
Telecommunications and utility grounding checks
When it may not be suitable
This device is specifically designed for clamp-on resistance and leakage current measurements. It is not intended for use in high-voltage transmission lines exceeding the specified current range or for applications requiring direct contact resistance testing where a clamp-on method is not applicable.
Key specifications
Resistance measurement range: 0.01 Ohm to 800 Ohm
Leakage current measurement range: 0mA to 20A
Jaw opening: 32mm
Display: EBTN LCD with backlight
Data storage capacity: 300 sets
Power source: 4 x 1.5V (LR6) batteries
Safety features: Audible and visual alarms, auto power-off, auto-calibration
How to use
To operate the UNI-T UT278A+, ensure the batteries are correctly installed and the device is powered on. Simply open the 32mm jaw and clamp it around the grounding conductor or wire being tested. The device will automatically detect the resistance and leakage current, displaying the results clearly on the EBTN screen. Use the data hold function to freeze readings if necessary, or save them to the internal memory for later analysis. Ensure the jaw is fully closed for accurate results and avoid placing the device near strong electromagnetic fields that could interfere with the reading.
What to consider before purchase
Verify that the conductor diameter fits within the 32mm jaw opening.
Ensure the expected resistance and current values fall within the specified measurement ranges.
Consider the environment of use, as the device is optimized for grounding systems where a loop can be formed.
Check that the required 1.5V LR6 batteries are available for operation.
Usage recommendations: Regularly perform auto-calibration to maintain measurement accuracy. Always keep the jaw contact surfaces clean and free of debris to ensure optimal performance and reliable readings during every inspection.

## FAQ

### How much does the UNI-T UT278A+ Clamp Earth Ground Tester cost, and is it available for purchase?

The price is 418.95 € (valid at the time of publication and already includes all taxes). The item is available for order — 10 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 Wednesday 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 UNI-T UT278A+ Clamp Earth Ground Tester 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/12574813/68941705_large.webp