The Uni-T UT522 is a practical instrument for measuring earth resistance and AC earth voltage in installations, power engineering, and lightning protection systems. It offers measurements up to 4000 Ω, voltage up to 400 V, supports both the 2-wire and the more accurate 3-wire method, and thanks to the backlit display, Data Hold function, and poor-contact indication, it is ideal for everyday field work.
The Uni-T UT522 earth resistance tester is designed for reliable verification of grounding in electrical installations, distribution systems, and lightning protection. A wide measuring range and selectable measurement methods help you obtain accurate results both for basic inspections and professional applications.
For easy field use, it features a clear backlit LCD display, Data Hold to freeze the measured value, and useful warnings for overrange or poor contact. Its compact design, battery power, auto power-off, and low-battery indication improve convenience for mobile use.
Main advantages:
- Earth resistance measurement up to 4000 Ω
- AC earth voltage measurement up to 400 V
- Support for 2-wire and 3-wire measurement
- Backlit display for good readability
- Data Hold for convenient reading
- Poor-contact and overrange indication
- Double insulation and compliance with CE and UKCA
Package contents:
- Uni-T UT522 earth resistance tester
- Batteries
- Straight test leads with alligator clips
- Standard test leads with alligator clips
- Grounding stakes
- Carrying strap
Specifications
- Manufacturer
- Uni-T
- Model
- UT522
- Earth resistance measurement (range)
- 0–40 Ω
- Earth resistance measurement accuracy (0–40 Ω)
- ±(2% + 20)
- Earth resistance measurement (range)
- 0–400 Ω
- Earth resistance measurement accuracy (0–400 Ω)
- ±(2% + 3)
- Earth resistance measurement (range)
- 0–4000 Ω
- Earth resistance measurement accuracy (0–4000 Ω)
- ±(2% + 3)
- AC earth voltage measurement (range)
- 0–400 V
- AC earth voltage measurement accuracy
- ±(1% + 6)
- Supported frequency
- 50 Hz / 60 Hz
- Measurement methods
- 2-wire and 3-wire
- Display
- Backlit LCD
- Maximum measuring range
- 4000
- Power supply
- 6× LR6 1.5 V batteries
- Dimensions
- 160 × 100 × 70.5 mm
- Net weight
- 560 g
