Uni-T
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Register to see prices Already a partner? Log inThe Uni-T UT522 Earth Resistance Tester is a practical device for measuring earth resistance and AC earth voltage, designed for use in electrical installations, power systems, and lightning protection systems. The UT522 model offers a resistance measurement range up to 4000Ω and a voltage range up to 400V, and supports both the simple 2-wire method and the more accurate 3-wire method. Thanks to manual range selection, a clear backlit display, and features such as result hold and bad contact indication, the device is well-suited for daily field work. The compact housing and battery power further facilitate mobile use.
The UT522 enables earth resistance measurement across a wide range up to 4000Ω, making it suitable for both simple installations and more demanding systems. Support for the 3-wire method increases measurement accuracy, ensuring more reliable results in professional applications.
The backlit LCD display makes it easy to read results even in low light. The Data Hold function allows you to freeze the result on the screen, which is useful when working in hard-to-reach places. Additionally, the device alerts you when the range is exceeded or when there is poor contact, helping to avoid measurement errors.
Its lightweight design and compact dimensions make the UT522 well-suited for mobile use. Automatic shut-off after approximately 10 minutes reduces battery consumption, and the low-battery indicator helps prevent unexpected interruptions in work.
The device features double insulation, which enhances user safety when working with electrical installations. Compliance with CE and UKCA certifications confirms adherence to European quality and safety standards.
ManufacturerUni-TModelUT522Earth resistance measurement0–40Ω, accuracy ±(2%+20)Earth resistance measurement0–400Ω, accuracy ±(2%+3)Earth resistance measurement0–4000Ω, accuracy ±(2%+3)AC earth voltage measurement0–400V, accuracy ±(1%+6)Supported frequency50Hz / 60HzMeasurement methods2-wire and 3-wireDisplayBacklit LCDCounts4000Power supply6 × 1.5V LR6 batteriesDimensions160 × 100 × 70.5 mmNet weight560 g
