UNI-T UT522 Digital Grounding Tester Ground Resistance Tester

The UNI-T UT522 is a digital grounding tester designed specifically for precise earth resistance measurements. This device allows for simple 2-wire as well as precise 3-wire measurements, making it ideal for use on power and electrical systems, lightning protection systems and grounding systems of all electrical devices. With its lightweight design, the UT522 is particularly suitable for field use. This measuring device offers high economic benefits and is an indispensable tool for electricians and technicians.


  • Manual measuring range: The UT522 allows manual range selection to increase measuring accuracy.
  • Low battery level display: A display warns you when the battery is low to ensure continuous operation.
  • Data hold function: This function allows you to save measurement values ​​and read them later.
  • LCD backlight: The backlight of the display makes it easier to read the values ​​even in poor lighting conditions.
  • Double insulation: For increased safety and reliability, the UT522 is equipped with double insulation.
  • Poor contact alert: The device displays "Ω" if the contact is poor to alert you to possible sources of error.
  • Overrange display: Displays "OL" if the measuring range is exceeded.

Application examples:

  • Measuring the earth resistance in industrial power supply systems.
  • Checking the grounding in lightning protection systems.
  • Testing grounding systems in residential buildings.
  • Regular maintenance and inspection of grounding systems in electrical installations.
  • Use in the field for quick and accurate determination of grounding resistances.


Technical data:

  • Manufacturer: UNI-T  
  • Manufacturer SKU: UT522
  • Ground Resistance Measurement Ranges: 
    • 0~40Ω: ±(2%+20)
    • 0~400Ω: ±(2%+3)
    • 0~4000Ω: ±(2%+3)
  • Earth Voltage Measurement Range: 0~400V: ±(1%+6)
  • Frequency: 50Hz/60Hz
  • Power supply: 6 x 1.5V Batteries (LR6)
  • Display count: 4000
  • Data storage: available
  • Insulation: Double insulation protection
  • Display: Low battery warning, poor contact warning
  • Display functions: LCD backlight/automatic shutdown
  • Measurement methods: Simple 2-wire testing, Precise 3-wire testing
  • Category Ratings: CAT III 600V
  • Certificates: CE, UKCA
  • Display: 70.6mm x 34mm
  • Dimensions: 255 x 165 x 145mm
  • Weight: 2.2kg

Scope of Delivery:

  • 1x UNI-T UT522 Digital Grounding Tester
  • 1x Accessories (Simple Test Leads with Crocodile Clips, Standard Test Leads with Crocodile Clips, Earth Spikes, Carrying Strap, Carrying Case)

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UNI-T UT522 Digital Grounding Tester Ground Resistance Tester

  • Brand: UNI-T
  • Product Code: 423684
  • Availability: In Stock
  • CHF210.00

  • Ex Tax: CHF194.26

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Tags: UT522, Grounding Tester, Resistance Tester, Ground Resistance, Lightning Protection, Measuring Device, Technician, Electrician, Earth Resistance, Earth Voltage, UNI-T, Grounding, Tester