{"title":"Insulation Resistance Testers","description":"\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eEnsure the safety and reliability of your electrical systems with Checkline.lk's range of high-performance insulation testers — your essential tool for insulation resistance measurement and electrical safety verification across Sri Lanka.\u003c\/p\u003e\n\u003cp class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"\u003eWhether you're an electrician on a construction site, a maintenance engineer in an industrial plant, or a technician servicing motors and transformers, our insulation testers deliver the precision, durability, and confidence you need on every job.\u003c\/p\u003e","products":[{"product_id":"uni-t-ut139c-true-rms-digital-multimeter-6000-counts-ncv-temperature-tester","title":"UNI-T UT139C True RMS Digital Multimeter – 6000 Counts NCV Temperature Tester","description":"\u003ch3\u003eUNI-T UT139C True RMS Digital Multimeter\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eUNI-T UT139C\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a professional\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eTrue RMS digital multimeter\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efeaturing 6000-count resolution and smart auto-ranging for reliable electrical diagnostics across residential, commercial and light industrial applications. With 1000V AC\/DC voltage, 10A AC\/DC current, 60MΩ resistance, 60mF capacitance, 20MHz frequency, temperature measurement and NCV detection, this meter delivers comprehensive testing capability with CAT III 1000V safety rating. Its 3 readings\/second response and large backlit LCD make it perfect for electricians working in tight spaces and low-light conditions across Sri Lanka.\u003c\/p\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eUT139C\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eoffers True RMS accuracy for non-linear loads, smart auto\/manual ranging, MAX\/MIN\/REL modes, data hold, flashlight and sound\/light alarm functions. The ergonomic design with rubber holster and 318g weight ensures comfortable handling during extended service calls. Ideal for troubleshooting distribution boards, HVAC systems, solar inverters and appliance repairs from Colombo apartments to factory maintenance in Katunayake.\u003c\/p\u003e\n\u003ch3\u003eKey Features of UNI-T UT139C Multimeter\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e6000-Count True RMS Accuracy\u003c\/strong\u003e High-resolution display with True RMS for accurate measurements on inverters, LED drivers and switching power supplies.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eNCV Non-Contact Detection\u003c\/strong\u003e Sound and light alarms identify live wires safely before probe contact, perfect for initial circuit assessment.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eComplete Measurement Suite\u003c\/strong\u003e 1000V AC\/DC voltage, 10A AC\/DC current, 60MΩ resistance, 60mF capacitance, 20MHz frequency and K-type temperature.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmart Auto\/Manual Ranging\u003c\/strong\u003e Automatic range selection with manual override for precise control in professional diagnostics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBacklit Display + Flashlight\u003c\/strong\u003e Large illuminated LCD and built-in flashlight for clear readings inside DB boards and meter cabinets.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProfessional CAT III 1000V Safety\u003c\/strong\u003e Double insulation and overload protection suitable for mains wiring and light industrial environments.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCommon Applications of UT139C in Sri Lanka\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical Contractor Work\u003c\/strong\u003e Verify circuit loads, test insulation resistance and validate wiring installations in residential\/commercial projects.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHVAC System Service\u003c\/strong\u003e Measure compressor currents, control voltages, capacitor values and refrigerant pipe temperatures.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolar PV Troubleshooting\u003c\/strong\u003e Check inverter outputs, DC string voltages and AC grid connections in rooftop solar installations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAppliance Repair Shops\u003c\/strong\u003e Diagnose power supply faults, motor windings and control board electronics in household appliances.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications of UNI-T UT139C\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDC Voltage:\u003c\/strong\u003e 600mV~1000V ±(0.5%+2)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAC Voltage (True RMS):\u003c\/strong\u003e 6V~750V ±(1.0%+3)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAC\/DC Current:\u003c\/strong\u003e 600μA~10A ±(1.0%+2)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eResistance:\u003c\/strong\u003e 600Ω~60MΩ ±(0.8%+2)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCapacitance:\u003c\/strong\u003e 6nF~60mF ±(3.0%+5)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTemperature:\u003c\/strong\u003e −40°C~1000°C ±(1.0%+3)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplay \u0026amp; Safety:\u003c\/strong\u003e 6000-count LCD | 318g | CAT III 1000V\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x UNI-T UT139C True RMS Digital Multimeter\u003c\/li\u003e\n\u003cli\u003e1 x Test Lead Set\u003c\/li\u003e\n\u003cli\u003e1 x K-type Temperature Probe\u003c\/li\u003e\n\u003cli\u003e2 x AAA Batteries (installed)\u003c\/li\u003e\n\u003cli\u003e1 x Protective Holster\u003c\/li\u003e\n\u003cli\u003e1 x User Manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp class=\"Polaris-Text--root Polaris-Text--headingLg Polaris-Text--semibold Polaris-Text--base\" tabindex=\"-1\"\u003e\u003cspan\u003eDownloads: \u003cbr\u003e\u003c\/span\u003e\u003cspan\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0997\/0224\/3637\/files\/ut139-series-data-sheet.pdf?v=1779088424\"\u003eUt139-series-data-sheet.pdf 1\u003c\/a\u003e\u003cbr\u003e\u003c\/span\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0997\/0224\/3637\/files\/uni-t-ut139-series-manual.pdf?v=1779088424\"\u003eUni-t-ut139-series-manual.pdf 2\u003c\/a\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Checkline","offers":[{"title":"Default Title","offer_id":52895280759093,"sku":null,"price":21650.0,"currency_code":"LKR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/0224\/3637\/files\/uni-t-ut139c-true-rms-multimeter-6000-counts-front-view-ready-dmm.webp?v=1779788942"},{"product_id":"fluke-1537-insulation-tester","title":"FLUKE 1537 Insulation Tester","description":"\u003ch3\u003eFLUKE 1537 Insulation Tester\u003c\/h3\u003e\n\u003ch3\u003eProfessional Insulation Resistance Testing with PI\/DAR Analysis in Sri Lanka\u003c\/h3\u003e\n\u003cp\u003eThe\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eFluke 1537\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis a rugged, high-performance\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003edigital insulation tester\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003edelivering precise\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003einsulation resistance measurement\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eup to 2500V and 500 GΩ for demanding industrial, solar PV, and electrical maintenance applications in Sri Lanka. Featuring selectable test voltages from 250V to 2500V in 100V increments, automatic PI\/DAR calculations, and high 5mA short-circuit current for stable readings, it's ideal for electricians, maintenance engineers, and solar technicians requiring reliable diagnostics and compliance verification. With CAT IV 600V safety rating, live voltage alarm, and over 1300 tests per charge, the Fluke 1537 ensures field-ready performance in harsh environments.\u003c\/p\u003e\n\u003cp\u003eEngineered for comprehensive electrical testing, the Fluke 1537 combines insulation resistance testing with AC\/DC voltage (up to 1000V) and low-resistance measurements, plus timed PI\/DAR tests (1, 10, and 30 minutes) for complete insulation health assessment. Its large backlit LCD display, rugged IP40 housing with 1m drop protection, and intuitive one-button operation make it perfect for preventive maintenance on motors, cables, transformers, and PV systems across Sri Lanka's industrial and renewable energy sectors. Streamline troubleshooting and certification with this trusted Fluke insulation resistance tester built for professional reliability.\u003c\/p\u003e\n\u003ch3\u003eKey Features of the Fluke 1537 Insulation Tester\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eWide 250V-2500V Test Voltage Range\u003cbr\u003e\u003c\/strong\u003eSelectable test voltages in\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e100V increments: 250V, 500V, 1000V, 1500V, 2500V\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ewith insulation resistance measurement up to\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e500 GΩ\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003efor versatile cable, motor, and equipment testing.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh 5mA Short-Circuit Current\u003cbr\u003e\u003c\/strong\u003ePowerful\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e5mA test current\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eensures fast, stable insulation measurements even on large capacitive loads like transformers and long cables, reducing test time significantly.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAutomatic PI\/DAR Calculations\u003cbr\u003e\u003c\/strong\u003eBuilt-in\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003ePolarization Index (PI) and Dielectric Absorption Ratio (DAR)\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003ecalculations with 1, 10, and 30-minute timed tests for comprehensive insulation degradation analysis.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMulti-Function Measurements\u003cbr\u003e\u003c\/strong\u003eIncludes AC\/DC voltage measurement up to\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1000V\u003c\/strong\u003e, low-resistance testing (0.01Ω to 1kΩ), and live circuit voltage detection for complete electrical system diagnostics.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLive Voltage Alarm \u0026amp; Auto-Discharge\u003cbr\u003e\u003c\/strong\u003eAutomatic voltage detection with audible\/visual alarm prevents testing on live circuits; auto-discharge function safely removes residual charge after insulation tests.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh-Capacity Battery Performance\u003cbr\u003e\u003c\/strong\u003eRechargeable Li-ion battery delivers\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eover 1300 insulation tests per charge\u003c\/strong\u003e, with low battery indicator and multiple power-saving modes for extended field use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRugged Field-Ready Design\u003cbr\u003e\u003c\/strong\u003eIP40-rated housing with\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003e1m drop protection\u003c\/strong\u003e, ergonomic rubber holster, and large backlit LCD display readable in all lighting conditions for demanding work sites.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision Comparator Function\u003cbr\u003e\u003c\/strong\u003eProgrammable PASS\/FAIL thresholds with visual\/audible indicators streamline go\/no-go testing during acceptance, maintenance, and quality control inspections.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnhanced CAT IV Safety\u003cbr\u003e\u003c\/strong\u003eCAT IV 600V \/ CAT III 1000V\u003cspan\u003e \u003c\/span\u003esafety rating with 2x safety shutter design protects operators during testing in industrial distribution systems and substations.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCommon Applications for Fluke 1537 in Sri Lanka\u003c\/h3\u003e\n\u003cp\u003eThis\u003cspan\u003e \u003c\/span\u003e\u003cstrong\u003eadvanced insulation resistance tester\u003c\/strong\u003e\u003cspan\u003e \u003c\/span\u003eis purpose-built for:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial Motor \u0026amp; Generator Maintenance\u003cbr\u003e\u003c\/strong\u003eComprehensive insulation testing of AC\/DC motors, generators, and rotating equipment using PI\/DAR analysis to predict failures and schedule preventive maintenance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolar PV System Commissioning\u003cbr\u003e\u003c\/strong\u003eVerifies insulation quality in PV strings, inverters, and DC cabling during installation and annual maintenance, ensuring compliance with IEC standards and safety requirements.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Cable \u0026amp; Transformer Testing\u003cbr\u003e\u003c\/strong\u003eTests medium-voltage cables, distribution transformers, and switchgear insulation integrity, identifying degradation before costly failures disrupt operations.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical Installation Certification\u003cbr\u003e\u003c\/strong\u003eProvides documented proof of insulation resistance for building handovers, factory acceptance tests, and regulatory compliance inspections across commercial facilities.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eTechnical Specifications of the Fluke 1537\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation Test Voltages\u003cbr\u003e\u003c\/strong\u003e250V, 500V, 1000V, 1500V, 2500V DC (selectable in 100V steps); short-circuit current 5mA.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInsulation Resistance Ranges\u003cbr\u003e\u003c\/strong\u003eUp to 500 GΩ (250V\/500V); 200 GΩ (1000V); 100 GΩ (1500V); 50 GΩ (2500V) with 4-range detection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTest Accuracy\u003cbr\u003e\u003c\/strong\u003e±(1.5% rdg + 3 dgt) typical across primary ranges; high accuracy maintained across full measurement span.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage Measurement\u003cbr\u003e\u003c\/strong\u003e0-1000V AC\/DC (±2% rdg + 3 dgt); auto-ranging with live circuit detection threshold at 30V.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow Resistance Range\u003cbr\u003e\u003c\/strong\u003e0.01Ω to 1999Ω with 1mA test current for continuity and bonding verification.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePI\/DAR Timed Tests\u003cbr\u003e\u003c\/strong\u003e1 min\/10 min for DAR, 10 min for PI; automatic calculation and display of insulation quality ratios.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisplay \u0026amp; Resolution\u003cbr\u003e\u003c\/strong\u003eBacklit LCD with 0.01 MΩ resolution to 999.9 MΩ; analog bar graph for trending.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSafety \u0026amp; Durability\u003cbr\u003e\u003c\/strong\u003eCAT IV 600V \/ CAT III 1000V; IP40 rating; 1m drop test; operating temp -20°C to 50°C.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePower Source\u003cbr\u003e\u003c\/strong\u003eRechargeable Li-ion battery; \u0026gt;1300 tests per charge; USB charging capability.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Fluke 1537 Insulation Resistance Tester\u003c\/li\u003e\n\u003cli\u003e1 x AC Charging Adapter\u003c\/li\u003e\n\u003cli\u003e1 x Heavy-duty Test Leads with Alligator Clips\u003c\/li\u003e\n\u003cli\u003e1 x Remote Test Probe\u003c\/li\u003e\n\u003cli\u003e1 x Protective Rubber Holster\u003c\/li\u003e\n\u003cli\u003e1 x Rechargeable Li-ion Battery (installed)\u003c\/li\u003e\n\u003cli\u003e1 x USB Charging Cable\u003c\/li\u003e\n\u003cli\u003e1 x User Manual \u0026amp; Quick Reference Guide\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eDownloads\u003c\/h3\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0997\/0224\/3637\/files\/fluke-1537-data-sheet.pdf?v=1779778686\"\u003eFluke-1537-data-sheet 1.pdf\u003c\/a\u003e\u003cbr\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0997\/0224\/3637\/files\/fluke-1537-user-manual.pdf?v=1779778684\"\u003eFluke-1537-data-sheet 2.pdf\u003c\/a\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"Checkline","offers":[{"title":"Default Title","offer_id":52924202975541,"sku":null,"price":785000.0,"currency_code":"LKR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/0224\/3637\/files\/fluke-1537-insulation-tester-2500v-550-gigaohm-display.webp?v=1779788949"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0997\/0224\/3637\/collections\/4_2ed6dc0c-23fd-44c5-991b-a6a248f7d791.png?v=1779951626","url":"https:\/\/checkline.lk\/collections\/insulation-testers.oembed","provider":"Checkline","version":"1.0","type":"link"}