Professional UNI-T UT521 ground resistance tester for precise measurement of grounding resistance in power systems, lightning protection installations, and electrical distribution. Offers two-wire and three-wire measurements, manual range selection, data hold, low-battery indication, and auto power-off. The large backlit LCD ensures readability at any time, while double insulation and error indications (poor contact, overload OL) enhance safety.
The UNI-T UT521 is a reliable measuring instrument designed for accurate testing of grounding systems in industry, power engineering, and service. Thanks to its compact and lightweight design, it is ideal for field work, where you will appreciate fast two-wire tests and highly accurate three-wire measurements. The backlit LCD and Data Hold function enable comfortable operation even in demanding conditions.
For higher safety and reliability, the device offers double insulation protection, indication of poor contact and out of range (OL). Manual range selection gives you full control over measurement, while auto power-off saves battery life. CE and UKCA certifications confirm quality and safe operation.
- Universal use: power systems, lightning protection, grounding of electrical equipment
- Clear display: large backlit LCD for excellent readability
- Practical features: memory for 20 sets, Data Hold, low-battery indication
- Durable build: robust body, double insulation, auto power-off
Specifications
- Manufacturer
- UNI-T
- Model
- UT521
- Earth resistance measurement (Ω)
- 0–20 Ω (±(2% + 10)); 0–200 Ω (±(2% + 3)); 0–2000 Ω (±(2% + 3)); ranges 0–40 Ω, 0–400 Ω, 0–4000 Ω
- AC earth voltage measurement (V)
- 0–200 V (±(1% + 4)); 0–400 V
- Frequency
- 50 Hz / 60 Hz
- Display count
- 2000
- Manual range selection
- Yes
- Auto power-off
- Yes, after approx. 10 minutes of inactivity
- Low-battery indicator
- Yes
- Data Hold function
- Yes
- Data memory
- 20 sets
- LCD backlight
- Yes
- Full icon display
- Yes
- Double insulation protection
- Yes
- Poor contact indicator
- Yes
- Out-of-range indicator (OL)
- Yes
- Simple two-wire measurement
- Yes
- Accurate three-wire measurement
- Yes
- Power supply
- 6 × 1.5 V batteries (LR6)
- Display
- 70.6 × 34 mm
- Color
- red, gray
- Weight
- 560 g
- Dimensions
- 160 × 100 × 70.5 mm
- Package contents
- ground resistance tester, batteries, direct measurement leads with alligator clips, standard test leads with alligator clips, grounding stakes, carry bag, manual
