{"product_id":"mesr-100-esr-capacitor-tester-auto-ranging-low-ohm-meter","title":"MESR-100 ESR Capacitor Tester – Auto-Ranging Low Ohm Meter","description":"\n\u003ch2\u003eMESR-100 Professional ESR Capacitor \u0026amp; Low-Ohm Meter\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eMESR-100\u003c\/strong\u003e is a precision auto-ranging capacitor ESR (Equivalent Series Resistance) and low-ohm meter designed for electronics technicians, hobbyists, and repair professionals. Using a true \u003cstrong\u003e100 kHz sine-wave test signal\u003c\/strong\u003e, it measures capacitor internal resistance the same way capacitor manufacturers do — giving you accurate, reliable results fast.\u003c\/p\u003e\n\u003cp\u003eWith \u003cstrong\u003ein-circuit testing capability\u003c\/strong\u003e, you can check capacitors directly on the board without desoldering, making it indispensable when troubleshooting TVs, LCD monitors, audio amplifiers, and other electronic equipment. A handy printed reference table is included right on the unit for instant pass\/fail assessment.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAuto-Ranging:\u003c\/strong\u003e Measurement range from 0.001 Ω to 100.0 Ω — no manual range selection needed\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTrue 100 kHz Sine-Wave Signal:\u003c\/strong\u003e Cancels capacitive impedance for a pure ESR reading that matches factory test methods\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIn-Circuit Testing:\u003c\/strong\u003e Applies less than 15 mV DC peak-to-peak, keeping capacitors safe while they remain on the board\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e4-Digit High Resolution:\u003c\/strong\u003e Reads down to 0.001 Ω in the 0–1 Ω range\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual Test Clips:\u003c\/strong\u003e Fast, easy connection to capacitor leads for quick inspection\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFlexible Power Options:\u003c\/strong\u003e Runs on 2 × AA batteries (not included) for over 80 hours of use, or via 5 V Micro-USB\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Lightweight:\u003c\/strong\u003e Approx. 14.5 × 8 × 3 cm \/ 139.6 g — easy to handle on the bench or in the field\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBuilt-In Reference Table:\u003c\/strong\u003e Printed directly on the unit for instant ESR range verification\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eMeasurement Accuracy\u003c\/h3\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse; border:1px solid #ddd;\"\u003e\n  \u003cthead\u003e\n    \u003ctr style=\"background:#f5f5f5;\"\u003e\n      \u003cth style=\"padding:8px; border:1px solid #ddd;\"\u003eRange\u003c\/th\u003e\n      \u003cth style=\"padding:8px; border:1px solid #ddd;\"\u003eAccuracy\u003c\/th\u003e\n      \u003cth style=\"padding:8px; border:1px solid #ddd;\"\u003eRefresh Time (Manual)\u003c\/th\u003e\n    \u003c\/tr\u003e\n  \u003c\/thead\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e0.000 – 1.000 Ω\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e1% + 2 Digit\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e~0.4 s\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e1.000 – 10.00 Ω\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e1% + 1 Digit\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e~0.4 s\u003c\/td\u003e\n    \u003c\/tr\u003e\n    \u003ctr\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e10.00 – 100.0 Ω\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e2% + 1 Digit\u003c\/td\u003e\n      \u003ctd style=\"padding:8px; border:1px solid #ddd;\"\u003e~0.4 s\u003c\/td\u003e\n    \u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cem\u003eAuto mode: 0–2 s (additional time may be needed depending on capacitance value).\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Black\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMeasurement Range:\u003c\/strong\u003e 0.001 Ω – 100.0 Ω\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Range Support:\u003c\/strong\u003e Capacitors \u0026gt;1 µF\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eResolution:\u003c\/strong\u003e 4-digit \/ 0.001 Ω @ 1 Ω range\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTest Voltage:\u003c\/strong\u003e \u0026lt;15 mV DC (peak-to-peak)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePower Supply:\u003c\/strong\u003e 5 V Micro-USB or 2 × AA 1.5 V batteries (not included)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOperating Current:\u003c\/strong\u003e 0.02 A\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBattery Life:\u003c\/strong\u003e \u0026gt;80 hours\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eItem Size:\u003c\/strong\u003e Approx. 14.5 × 8 × 3 cm (5.7 × 3.1 × 1.2 in)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eItem Weight:\u003c\/strong\u003e Approx. 139.6 g (4.9 oz)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Made in Mainland China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × MESR-100 Capacitor ESR Meter\u003c\/li\u003e\n  \u003cli\u003e2 × Test Clips\u003c\/li\u003e\n  \u003cli\u003e1 × User Manual\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eNote: Batteries are NOT included. This meter tests capacitor internal resistance (ESR), not capacitance value.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/screw-extractor-drill-bit-set-carbon-steel-double-sided\"\u003eScrew Extractor Drill Bit Set 5 \u0026amp; 6 Pc – Carbon Steel\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/adjustable-label-roll-holder-3d-printed-thermal-printer-stand\"\u003eAdjustable Label Roll Holder – 3D Printed Thermal Printer Stand\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/personal-protective-equipment\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on personal protective equipment\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What does the MESR-100 ESR meter actually measure?\u003c\/h4\u003e\n\u003cp\u003eA: The MESR-100 measures the \u003cstrong\u003eEquivalent Series Resistance (ESR)\u003c\/strong\u003e of capacitors — the internal resistance found in series within a capacitor. A high ESR reading often indicates a failing or degraded capacitor even when its capacitance value appears normal. This makes the MESR-100 extremely valuable for diagnosing faults in TVs, monitors, audio boards, and other electronics.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I test capacitors while they are still on the circuit board?\u003c\/h4\u003e\n\u003cp\u003eA: Yes! The MESR-100 supports \u003cstrong\u003ein-circuit testing\u003c\/strong\u003e. It applies less than 15 mV DC peak-to-peak, which is low enough not to affect other components on the board. This allows you to quickly test capacitors without the time-consuming process of desoldering each one.\u003c\/p\u003e\n\u003ch4\u003eQ: What power source does the MESR-100 use?\u003c\/h4\u003e\n\u003cp\u003eA: The meter supports two power options: \u003cstrong\u003e2 × AA 1.5 V batteries\u003c\/strong\u003e (not included) offering over 80 hours of use, or a \u003cstrong\u003e5 V Micro-USB cable\u003c\/strong\u003e for bench work. This flexibility makes it suitable for both field repairs and workshop use.\u003c\/p\u003e\n\u003ch4\u003eQ: Is the MESR-100 suitable for beginners?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. The auto-ranging function eliminates the need to manually select measurement ranges, and the built-in printed reference table on the unit helps you quickly interpret readings. The included test clips and user manual make setup straightforward even for those new to ESR testing.\u003c\/p\u003e\n\u003c!-- production-packaging-notice --\u003e\n\u003ch3\u003eProduction \u0026amp; Packaging Notice\u003c\/h3\u003e\n\u003cp\u003eTo maintain high stock availability and fast shipping times, our items are sourced from multiple verified manufacturing facilities. While the core quality, materials, and product specifications remain identical, you may notice slight variations in the packaging design, manufacturing origin, or the wording of the printed instructions.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What does the MESR-100 ESR meter actually measure?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The MESR-100 measures the Equivalent Series Resistance (ESR) of capacitors — the internal resistance found in series within a capacitor. A high ESR reading often indicates a failing or degraded capacitor even when its capacitance value appears normal. 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