{"product_id":"uni-t-ut521-digital-earth-resistance-tester","title":"UNI-T UT521 Digital Earth Resistance Tester","description":"\u003ch2\u003eUNI-T UT521 Digital Earth Resistance Tester in Sri Lanka\u003c\/h2\u003e\n\n\u003ch3\u003eManual-Range 3-Pole Earth Pit Tester for Ground Resistance Measurement\u003c\/h3\u003e\n\n\u003cp\u003e\n  The \u003cstrong\u003eUNI-T UT521 Digital Earth Resistance Tester\u003c\/strong\u003e is a robust, entry-level instrument designed for accurate measurement of earth electrode resistance and ground rod resistance using the standard 3-pole fall-of-potential method. It is an essential tool for electricians and electrical engineers in Sri Lanka who need to verify earthing system integrity at industrial sites, residential installations, and power distribution infrastructure.\n\u003c\/p\u003e\n\n\u003cp\u003eExplore our complete range of \u003ca href=\"\/collections\/earth-resistance-testers\" target=\"_blank\"\u003eEarth Resistance Testers — digital earth testers, ground resistance meters, and loop impedance instruments in Sri Lanka!\u003c\/a\u003e\u003c\/p\u003e\n\n\u003cp\u003e\n  With manual range selection, clear digital LCD display, and a built-in interference voltage check, the UT521 ensures reliable earth resistance readings even in electrically noisy environments. Its compact, handheld form factor makes it ideal for field earth pit testing and periodic grounding system verification across multiple sites.\n\u003c\/p\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cdl class=\"package-list\"\u003e\n  \u003cdd\u003e\n\u003cstrong\u003eEarth Resistance Range\u003c\/strong\u003e: 0~200Ω \/ 0~2kΩ \/ 0~20kΩ (manual range)\u003c\/dd\u003e\n  \u003cdd\u003e\n\u003cstrong\u003eResolution\u003c\/strong\u003e: 0.01Ω (200Ω range)\u003c\/dd\u003e\n  \u003cdd\u003e\n\u003cstrong\u003eAccuracy\u003c\/strong\u003e: ±(2%+5dgts) for 200Ω; ±(3%+5dgts) for 2kΩ\/20kΩ\u003c\/dd\u003e\n  \u003cdd\u003e\n\u003cstrong\u003eTest Method\u003c\/strong\u003e: 3-pole \/ 2-pole earth resistance measurement\u003c\/dd\u003e\n  \u003cdd\u003e\n\u003cstrong\u003eTest Frequency\u003c\/strong\u003e: ~820Hz (built-in)\u003c\/dd\u003e\n  \u003cdd\u003e\n\u003cstrong\u003eInterference Voltage\u003c\/strong\u003e: AC ≤30V detection\u003c\/dd\u003e\n  \u003cdd\u003e\n\u003cstrong\u003eAuxiliary Electrode Resistance\u003c\/strong\u003e: ≤50kΩ (C), ≤50kΩ (P)\u003c\/dd\u003e\n  \u003cdd\u003e\n\u003cstrong\u003eDisplay\u003c\/strong\u003e: 3½-digit LCD\u003c\/dd\u003e\n  \u003cdd\u003e\n\u003cstrong\u003ePower\u003c\/strong\u003e: 6 × 1.5V AA batteries\u003c\/dd\u003e\n  \u003cdd\u003e\n\u003cstrong\u003eDimensions\u003c\/strong\u003e: Approx. 195 × 90 × 52mm\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cdl class=\"package-list\"\u003e\n  \u003cdd\u003e\n\u003cstrong\u003eManual Range Selection\u003c\/strong\u003e: Choose between 200Ω, 2kΩ, and 20kΩ ranges to suit different earth electrode conditions\u003c\/dd\u003e\n  \u003cdd\u003e\n\u003cstrong\u003eInterference Voltage Alarm\u003c\/strong\u003e: Detects AC interference up to 30V to warn of stray current that could distort readings\u003c\/dd\u003e\n  \u003cdd\u003e\n\u003cstrong\u003e3-Pole and 2-Pole Testing\u003c\/strong\u003e: Supports both standard fall-of-potential and simplified 2-wire methods for flexible site testing\u003c\/dd\u003e\n  \u003cdd\u003e\n\u003cstrong\u003eCompact Handheld Design\u003c\/strong\u003e: Lightweight body suits field service use with easy one-hand operation\u003c\/dd\u003e\n  \u003cdd\u003e\n\u003cstrong\u003eAuxiliary Electrode Tolerance\u003c\/strong\u003e: High auxiliary resistance tolerance reduces errors from poor soil contact\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch3\u003eApplications\u003c\/h3\u003e\n\u003cdl class=\"package-list\"\u003e\n  \u003cdd\u003eEarth pit resistance testing at industrial facilities and substations\u003c\/dd\u003e\n  \u003cdd\u003eGround rod resistance verification at residential and commercial buildings\u003c\/dd\u003e\n  \u003cdd\u003eRoutine earthing system inspection for electrical compliance audits\u003c\/dd\u003e\n  \u003cdd\u003eGrounding continuity checks at telecom towers and lightning protection systems\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003ch3\u003ePackage Includes\u003c\/h3\u003e\n\u003cdl class=\"package-list\"\u003e\n  \u003cdd\u003e1 × UNI-T UT521 Digital Earth Resistance Tester\u003c\/dd\u003e\n  \u003cdd\u003e3 × Test lead wires (C, P, E terminals)\u003c\/dd\u003e\n  \u003cdd\u003e2 × Earth spike auxiliary electrodes\u003c\/dd\u003e\n  \u003cdd\u003e6 × AA batteries (installed)\u003c\/dd\u003e\n  \u003cdd\u003eCarrying case\u003c\/dd\u003e\n  \u003cdd\u003eEnglish user manual\u003c\/dd\u003e\n\u003c\/dl\u003e\n\n\u003cp\u003eIf you require auto-ranging convenience for faster on-site earth testing, consider the \u003ca href=\"\/products\/uni-t-ut522-digital-earth-resistance-meter\"\u003eUNI-T UT522 Digital Earth Resistance Meter\u003c\/a\u003e with automatic range switching and enhanced display.\u003c\/p\u003e\n\n\u003ch3\u003eDownloads\u003c\/h3\u003e\n\u003cp\u003e\n  \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0679\/7587\/2725\/files\/uni-t-ut521-data-sheet.pdf\" target=\"_blank\"\u003e📄 Download UNI-T UT521 Data Sheet\u003c\/a\u003e\u003cbr\u003e\n  \u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0679\/7587\/2725\/files\/uni-t-ut521-user-manual.pdf\" target=\"_blank\"\u003e📄 Download UNI-T UT521 User Manual\u003c\/a\u003e\n\u003c\/p\u003e\n\n\u003cdiv class=\"product-vendor\"\u003e\n  \u003cstrong\u003eBrand:\u003c\/strong\u003e \u003ca href=\"\/collections\/vendors?q=UNI-T\"\u003eUNI-T\u003c\/a\u003e\n\u003c\/div\u003e\n\u003cdiv id=\"variant-inventory\"\u003e\u003cspan class=\"in-stock\"\u003eIn stock!\u003c\/span\u003e\u003c\/div\u003e","brand":"UNI-T","offers":[{"title":"Default Title","offer_id":50892964757717,"sku":"","price":69500.0,"currency_code":"LKR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0679\/7587\/2725\/files\/UT521-1.jpg?v=1736251270","url":"https:\/\/nanozone.lk\/products\/uni-t-ut521-digital-earth-resistance-tester","provider":"NanoZone.LK","version":"1.0","type":"link"}