UNI-T UT522 Earth Resistance Tester

Professional earth resistance tester with dual-mode 2-wire and 3-wire measurement capability, delivering reliable readings across three ranges (0-40 Ω, 0-400 Ω, 0-4000 Ω) with high accuracy. The large backlit LCD, data hold, auto power off, and low battery indication make it ideal for field use. Safety rated CAT III 600 V / CAT IV 300 V, it runs on six AA batteries and operates from 0°C to 40°C.

Advantages

Precision measurement with 820 Hz test frequency minimizes interference. Supports both 2-wire and 3-wire methods for flexible testing. Backlit display ensures readability in low light. Auto power off conserves battery life. Robust safety ratings for demanding environments.

Suitable for

• Electrical contractors verifying grounding systems
• Maintenance technicians in industrial plants
• Telecom and utility field engineers
• Safety inspectors performing periodic checks

Key specifications

• Earth resistance ranges: 0-40 Ω, 0-400 Ω, 0-4000 Ω
• Earth resistance accuracy: ±(2%+20) for 0-40 Ω; ±(2%+3) for higher ranges
• AC earth voltage: 0-400 V, accuracy ±(2%+3)
• Measurement method: 2-wire and 3-wire
• Test current frequency: 820 Hz
• Display: LCD with backlight
• Data hold, auto power off (approx. 10 min), low battery indication, over range indication ('OL')
• Power: 6 x 1.5 V AA batteries
• Safety: CAT III 600 V, CAT IV 300 V
• Operating temperature: 0°C to 40°C

Recommendations

Ideal for professionals who need a reliable, portable earth resistance tester with dual-mode measurement and high safety ratings.