{"product_id":"esr2501c-capacitor-esr-dcr-tester-in-circuit-capacitance-meter","title":"ESR2501C Capacitor ESR DCR Tester – In-Circuit LCD Meter","description":"\u003ch2\u003eESR2501C Capacitor ESR \u0026amp; DCR Tester — Precision In-Circuit Capacitance Meter\u003c\/h2\u003e\n\u003cp\u003eThe \u003cstrong\u003eESR2501C\u003c\/strong\u003e is a professional-grade capacitor tester that accurately measures \u003cstrong\u003eEquivalent Series Resistance (ESR)\u003c\/strong\u003e and \u003cstrong\u003eDC Resistance (DCR)\u003c\/strong\u003e of electrolytic capacitors — both in-circuit and offline. Featuring a clear \u003cstrong\u003eLCD display\u003c\/strong\u003e, auto-zero calibration, overvoltage protection, and smart auto-shutoff, this meter is an essential tool for electronics technicians, hobbyists, and engineers who demand reliable, repeatable results.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eMade in Mainland China.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-Precision Measurement:\u003c\/strong\u003e Dual measuring range — 0–5Ω (resolution: 0.01Ω) and 5–25Ω (resolution: 0.1Ω) — with automatic range switching for seamless testing.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eIndustry-Standard 100 kHz Test Frequency:\u003c\/strong\u003e Measures ESR at the recognized 100 kHz standard frequency with a safe 5 mA measuring current, ensuring accurate, real-world results.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTrue ESR via Synchronous Detection:\u003c\/strong\u003e Synchronous short-circuit detection technology ensures the displayed value reflects the true ESR of the capacitor, not interference from the surrounding circuit.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eESR \/ DCR Mode Switching:\u003c\/strong\u003e Instantly toggle between ESR and DCR (DC resistance) measurement using the ON\/OFF\/ZERO button — ideal for comprehensive capacitor analysis.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAutomatic Zero Adjustment:\u003c\/strong\u003e Auto-zeroing activates at power-on and again each time you switch between ESR and DCR modes. The LCD simultaneously shows the ESR value and the probe compensation value so you can fine-tune zero for maximum accuracy.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTemperature Compensation:\u003c\/strong\u003e Built-in temperature compensation enhances measurement stability across varying operating environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eOvervoltage Input Protection:\u003c\/strong\u003e Protects the meter's input circuitry from accidental voltage spikes during live-circuit testing.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSmart Auto-Shutoff:\u003c\/strong\u003e Automatically powers down after ~5 minutes of inactivity to conserve battery life. Low-voltage detection triggers an LCD warning and shuts the unit off after 10 seconds.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRechargeable Battery Support:\u003c\/strong\u003e Uses a 3.7V 14500 lithium rechargeable battery (not included). Can be used while charging via DC 5–6V input. On-board charging indicator: red = charging, green = fully charged. Typical charge time: 2–3 hours. Max operating current: ~60 mA at 3.7V.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUser-Friendly Interface:\u003c\/strong\u003e Simple controls and a clear LCD make this meter accessible for beginners while delivering the accuracy demanded by professionals.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width:100%; border-collapse:collapse;\"\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eMeasuring Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e0–25Ω (auto-switching: 0–5Ω \/ 5–25Ω)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eResolution\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e0.01Ω (0–5Ω range) \/ 0.1Ω (5–25Ω range)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eAccuracy\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e±1.5% ±0.01Ω (0–5Ω) \/ ±1.5% ±0.1Ω (5–25Ω)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eTest Frequency\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e100 kHz\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eMeasuring Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e5 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eDisplay\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003eLCD\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eBattery\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e3.7V 14500 Li-ion rechargeable (not included)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eCharging Input\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003eDC 5–6V via USB\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eProduct Dimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e125 × 80 × 32 mm \/ 4.92 × 3.15 × 1.26 in\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"padding:6px 10px; border:1px solid #ddd;\"\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × ESR2501C Tester Unit\u003c\/li\u003e\n  \u003cli\u003e2 × Test Pens\u003c\/li\u003e\n  \u003cli\u003e2 × Test Clips\u003c\/li\u003e\n  \u003cli\u003e1 × USB Charging Cable\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eNote:\u003c\/strong\u003e Battery is \u003cu\u003enot included\u003c\/u\u003e. A 3.7V 14500 lithium rechargeable battery is required for operation.\u003c\/p\u003e\n\n\u003cp\u003eFor more information on electrical safety best practices when working with testing equipment, visit the \u003ca href=\"https:\/\/www.osha.gov\/electrical\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eOSHA Electrical Safety Guidelines\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: Can the ESR2501C measure capacitors while they are still installed on a circuit board?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The ESR2501C supports both in-circuit and offline capacitor testing. Its synchronous detection method ensures the displayed ESR value reflects the true capacitor ESR, minimizing interference from surrounding components during in-circuit measurements.\u003c\/p\u003e\n\n\u003ch4\u003eQ: What type of battery does the ESR2501C require, and is it included?\u003c\/h4\u003e\n\u003cp\u003eA: The ESR2501C requires a 3.7V 14500 lithium rechargeable battery (similar in size to an AA battery). A battery is \u003cstrong\u003enot included\u003c\/strong\u003e with the unit. The meter can be used while charging via a DC 5–6V USB power source, and the onboard LED indicates charging status (red = charging, green = full).\u003c\/p\u003e\n\n\u003ch4\u003eQ: What is the difference between ESR and DCR measurement on this meter?\u003c\/h4\u003e\n\u003cp\u003eA: ESR (Equivalent Series Resistance) is measured at 100 kHz AC and reflects the real-world resistive losses of a capacitor — a critical indicator of capacitor health. DCR (DC Resistance) measures the purely resistive component under DC conditions. The ESR2501C lets you switch between both modes using the ON\/OFF\/ZERO button, making it a versatile tool for thorough capacitor evaluation.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I zero the ESR2501C for accurate readings?\u003c\/h4\u003e\n\u003cp\u003eA: The meter performs automatic zero adjustment every time it powers on and each time you switch between ESR and DCR modes. The LCD displays both the measured ESR value and the probe compensation value simultaneously, allowing you to monitor and fine-tune the zero adjustment manually if needed for the highest accuracy.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"Can the ESR2501C measure capacitors while they are still installed on a circuit board?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. The ESR2501C supports both in-circuit and offline capacitor testing. Its synchronous detection method ensures the displayed ESR value reflects the true capacitor ESR, minimizing interference from surrounding components during in-circuit measurements.\"}}, {\"@type\": \"Question\", \"name\": \"What type of battery does the ESR2501C require, and is it included?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The ESR2501C requires a 3.7V 14500 lithium rechargeable battery (similar in size to an AA battery). A battery is not included with the unit. The meter can be used while charging via a DC 5–6V USB power source, and the onboard LED indicates charging status (red = charging, green = full).\"}}, {\"@type\": \"Question\", \"name\": \"What is the difference between ESR and DCR measurement on this meter?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"ESR (Equivalent Series Resistance) is measured at 100 kHz AC and reflects the real-world resistive losses of a capacitor — a critical indicator of capacitor health. DCR (DC Resistance) measures the purely resistive component under DC conditions. The ESR2501C lets you switch between both modes using the ON\/OFF\/ZERO button, making it a versatile tool for thorough capacitor evaluation.\"}}, {\"@type\": \"Question\", \"name\": \"How do I zero the ESR2501C for accurate readings?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The meter performs automatic zero adjustment every time it powers on and each time you switch between ESR and DCR modes. The LCD displays both the measured ESR value and the probe compensation value simultaneously, allowing you to monitor and fine-tune the zero adjustment manually if needed for the highest accuracy.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/kujrmc-0q.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Tools \u0026 Hardware\", \"item\": \"https:\/\/kujrmc-0q.myshopify.com\/collections\/tools-hardware\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"ESR2501C Capacitor ESR DCR Tester – In-Circuit LCD Meter\", \"item\": \"https:\/\/kujrmc-0q.myshopify.com\/products\/esr2501c-capacitor-esr-dcr-tester-in-circuit-capacitance-meter\"}]}\u003c\/script\u003e","brand":"Vue","offers":[{"title":"ESR2501C \/ China Mainland","offer_id":48764049850560,"sku":"14:200006151#ESR2501C;200007763:201336100","price":108.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0772\/9338\/7968\/files\/S4e186404cbbb4e0cab009710c71665b3i.webp?v=1786336931","url":"https:\/\/vueselect.com\/products\/esr2501c-capacitor-esr-dcr-tester-in-circuit-capacitance-meter","provider":"Vue","version":"1.0","type":"link"}