UNI-T Digital Earth Resistance Tester 0–2000Ω | UT521
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The UNI-T UT521 is a digital earth resistance tester for checking the earthing systems of power installations, electrical equipment and lightning protection. It measures earth resistance up to 2000Ω and earth voltage up to 200V AC, with a precise 3-wire method and a quick 2-wire method for simple checks.
Key Features & Benefits
- Earth resistance to 2000Ω: three manual ranges (20Ω, 200Ω, 2000Ω) on a 2000-count display.
- Earth voltage measurement: checks earth voltage up to 200V AC before testing.
- 2-wire and 3-wire testing: precise 3-wire measurement with auxiliary earth stakes, or a simple 2-wire test where stakes cannot be driven.
- Data storage and hold: stores up to 20 readings and holds the reading on screen.
- Backlit LCD: large 70.6 × 34mm display with full icon display for use in poor light.
- Poor contact and over-range indication: shows a warning on poor probe contact and "OL" when over range.
- Battery saving: low battery indication and auto power-off after about 10 minutes.
- Double insulation: double-insulated construction, CE and UKCA certified.
Technical Specifications
| Specification | Value |
|---|---|
| Model | UT521 |
| Earth resistance ranges | 0–20Ω / 0–200Ω / 0–2000Ω |
| Earth resistance accuracy | 20Ω: ±(2%+10); 200Ω and 2000Ω: ±(2%+3) |
| Earth voltage (AC) | 0–200V |
| Test frequency | 50Hz / 60Hz |
| Test method | 2-wire (simple) and 3-wire (precise) |
| Ranging | Manual |
| Display | 2000-count LCD, 70.6 × 34mm, backlit |
| Data storage | 20 readings |
| Auto power-off | Approx. 10 minutes |
| Power | 6 × 1.5V AA (LR6) batteries |
| Dimensions | 160 × 100 × 70.5mm |
| Net weight | 560g |
| Colour | Red and grey |
| Certifications | CE, UKCA |
What's in the Box
- 1 × UNI-T UT521 digital earth tester
- 3 × test leads (green, yellow, red)
- 2 × alligator-clip test leads (green, red)
- 2 × auxiliary earth stakes
- 6 × 1.5V AA batteries
- 1 × English user manual
Applications / Ideal For
- Earth resistance testing of power distribution and electrical installations
- Lightning protection and earthing system inspection
- Telecommunications, oil and gas, chemical and manufacturing plants
- Construction sites and building handover testing
- Electrical contractors and maintenance teams
Why Buy from Techno Tools
- Genuine UNI-T stock held in Malaysia, not grey-market imports.
- Fast delivery nationwide, with same-day delivery in the Klang Valley.
- Local warranty support from our team in Selangor.
- B2B friendly: formal quotations, invoices and bulk pricing for companies and contractors.
| Warranty period | 1 Year Warranty |
|---|---|
| Coverage | Free repair or replacement for defects in material and workmanship arising during normal use within 1 year from the date of purchase. |
| Not covered | Fuses, batteries, test leads and accessories; damage from accident, dropping, overload, misuse, or use outside the instrument's rated specifications. |
| Warranty void if | The instrument has been opened, repaired or modified by a party not authorised by UNI-T or its Malaysian distributor. |
Contact Techno Tools with your proof of purchase (invoice or receipt).
Order by 4PM to get delivered next working day! We use 24 hours service with carriers in most cases so that you can get your order delivered on time.
Free delivery for total orders above RM500, otherwise additional charges costs are calculated at checkout based on your order’s weight and delivery location.
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Please notify us within 14 calendar days of receiving your product to request a free exchange or full refund, if eligible. We will cover all return shipping costs, and no restocking fees will apply in this case.
Requests made after 14 days may be accepted at our discretion and will be subject to a 10% restocking fee. Techno Tools & Equipment reserves the right to reject any return request found to be ineligible.
Further details please click here for more info.