{"id":17680,"date":"2026-05-12T16:52:39","date_gmt":"2026-05-12T14:52:39","guid":{"rendered":"https:\/\/testnordic.se\/product\/mru-21-2\/"},"modified":"2026-05-12T16:52:39","modified_gmt":"2026-05-12T14:52:39","slug":"mru-21-2","status":"publish","type":"product","link":"https:\/\/testnordic.se\/en\/product\/mru-21-2\/","title":{"rendered":"MRU-21"},"content":{"rendered":"
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MRU-21 earth resistance meter \u2013 simple and reliable earth resistance measurement<\/span><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n<\/div>\n
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MRU-21 is a compact and user-friendly earth resistance meter designed for measuring earth resistance and continuity in protective and equipotential bonding conductors. The instrument is suitable for work in power distribution, industry and service applications where fast and reliable field measurements are required. <\/p>\n

The instrument supports both 2-wire and 3-wire measurement methods for earth resistance testing and delivers stable results even in environments with electrical interference. Thanks to its simple operation and clear display, MRU-21 is suitable for both daily maintenance work and more advanced inspection measurements. <\/p>\n

MRU-21 can also be used for testing protective and equipotential bonding conductors in accordance with applicable standards. The robust design combined with high measurement accuracy makes the instrument a practical tool for technicians working with grounding systems and electrical safety. <\/p>\n

The clear interface and compact construction make the instrument easy to transport and use on site.<\/p>\n

Why choose MRU-21<\/h2>\n
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  • Simple and fast earth resistance measurement<\/li>\n
  • Supports both 2-wire and 3-wire measurement methods<\/li>\n
  • Reliable results even in electrically noisy environments<\/li>\n
  • Testing of protective and equipotential bonding conductors<\/li>\n
  • Robust and user-friendly design<\/li>\n<\/ul>\n

    Technical summary<\/h2>\n
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    • Earth resistance measurement using 2-wire and 3-wire methods<\/li>\n
    • Earth resistance: 0.00 \u03a9 \u2013 1.99 k\u03a9<\/li>\n
    • Auxiliary electrode resistance measurement<\/li>\n
    • Interference voltage measurement<\/li>\n
    • Automatic test lead resistance zeroing<\/li>\n
    • Clear display for field measurements<\/li>\n
    • Complies with EN 61557 standards<\/li>\n
    • Suitable for industrial and power utility applications<\/li>\n<\/ul>\n