UNI-T UT521 Earth Ground Tester

The UNI-T UT521 Grounding Tester is a reliable device designed to accurately measure grounding resistance in power systems, lightning protection equipment and grounding systems of all kinds of electrical equipment. It enables both simple 2-wire measurement and accurate 3-wire measurement. The UT521 offers manual range selection, data hold function, low battery indicator and auto power off. The backlit LCD display ensures that the results can be read in all conditions. The device also features a full icon display, double protective insulation, weak contact and overload ("OL") indication. The tester is also CE and UKCA certified, which confirms high quality and safety.
Thanks to its light and compact design, the UT521 is ideal for field work, providing comfort and mobility. The manual range selection function allows full control of measurements, while error indicators such as bad contact and overload indication increase safety and accuracy. The tester can quickly perform simple 2-wire tests and accurate 3-wire measurements, making it a versatile tool for mechanics and service technicians alike.
The UT521 tester is designed for intensive use - double insulation effectively protects the user, and the automatic power-off function saves battery power. The large, backlit display makes it easier to work even in difficult lighting conditions, and the Data Storage function allows convenient saving of measurement results. The UNI-T UT521 is an excellent choice for all professionals looking for a precise, reliable and easy-to-use land surveying device.

- Model UT521
- Earthing resistance measurement (Ω) 0~20 Ω (accuracy: ±(2%+10)); 0~200 Ω (accuracy: ±(2%+3)); 0~2000 Ω (accuracy: ±(2%+3)); 0~40 Ω; 0~400 Ω; 0~4000 Ω
- AC ground voltage (V) measurement 0~200 V (accuracy: ±(1%+4)); 0~400V
- Frequency 50 Hz / 60 Hz
- The number of displayed digits is 2,000
- Manual range selection Supported
- Automatic shutdown Supported, approx. After 10 minutes of inactivity
- Low battery level indicator Built-in
- Data retention function Supported
- Data memory 20 sets
- LCD display backlight Built-in
- Full icon display Supported
- Double insulation protection Supported
- Low contact indicator ("...Ω") Built-in
- Out of range indicator ("OL") Built-in
- Simple 2-wire measurement Supported
- Accurate 3-wire measurement Supported
- Power supply 6 × 1.5 V batteries (LR6)
- Display 70.6 × 34 mm
- Product color Red, gray
- Weight 560 g
- Product dimensions 160 × 100 × 70.5 mm