{"product_id":"vr452-dc4-12v-battery-internal-resistance-tester-voltmeter","title":"VR452 Battery Internal Resistance Tester \u0026 Voltmeter DC 4–12V","description":"\u003ch2\u003eVR452 Internal Resistance Tester \u0026amp; Battery Voltmeter\u003c\/h2\u003e\n\u003cp\u003eGet precise, professional-grade battery diagnostics with the \u003cstrong\u003eVR452 DC 4–12V Internal Resistance Tester\u003c\/strong\u003e. Featuring a dual digital display with a red voltage readout and blue internal resistance readout, this compact module delivers accurate, at-a-glance measurements for lab technicians, electronics hobbyists, and battery engineers alike.\u003c\/p\u003e\n\n\u003cp\u003eUsing a 4-wire measurement system with a 1 kHz AC signal, the VR452 eliminates lead resistance errors for highly reliable readings. Its mΩ\/Ω auto-switching display keeps operation intuitive, while the wide DC 4–12V operating voltage means it adapts effortlessly to a broad range of bench setups and field applications.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eMade in Mainland China.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAccurate 4-Wire Measurement:\u003c\/strong\u003e 1 kHz AC signal method eliminates contact resistance errors for trustworthy voltage and internal resistance readings.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Operating Voltage:\u003c\/strong\u003e DC 4–12V input adapts to multiple power supply scenarios — ideal for diverse lab and workshop environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual Color Display:\u003c\/strong\u003e 0.56\" dual digital display — red for voltage, blue for internal resistance — for instant, clear readability.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAuto Unit Switching:\u003c\/strong\u003e Automatically switches between mΩ and Ω, streamlining your workflow without manual adjustments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Easy to Install:\u003c\/strong\u003e Measures just 48 × 29 × 22 mm, fitting neatly into custom enclosures, DIY testers, or professional lab equipment.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eStable Low Power Draw:\u003c\/strong\u003e Only 8 mA standby \/ 10 mA operating current keeps energy consumption minimal.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eFull Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eVR452\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMaterial\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003ePlastic + Metal\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC 4–12V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eStandby Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e8 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMeasurement Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e4-wire system, 1 kHz AC signal\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eVoltage Measurement Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC 0.00–45.0 V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eInternal Resistance Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e00.0 mΩ–999 mΩ \/ 1.00–2.00 Ω\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eUnit Display\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003emΩ \/ Ω automatic switching\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDisplay Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.56 inch dual digital\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDisplay Colors\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRed (voltage) \/ Blue (internal resistance)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eProduct Size\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e48 × 29 × 22 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePackage Contents\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e1 × VR452 tester module (batteries not included)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003e4-Pin Wire Definition\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003cspan style=\"color:red;\"\u003e\u003cstrong\u003eRed — I+\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eBlack — V+\u003c\/strong\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cspan style=\"color:green;\"\u003e\u003cstrong\u003eGreen — I−\u003c\/strong\u003e\u003c\/span\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003cstrong\u003eYellow — V−\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRelated Products You May Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/25-in-1-precision-magnetic-screwdriver-set-pro-repair-tool-kit\"\u003e25-in-1 Precision Magnetic Screwdriver Set | Pro Repair Kit\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/waterproof-cable-gland-set-pg7-pg9-nylon-connectors-10-pack\"\u003e10-Pack Waterproof Cable Glands PG7 PG9 Nylon Connectors\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/34-compartment-double-sided-hardware-storage-box-removable-dividers\"\u003e34-Compartment Double-Sided Hardware Storage Box \u0026amp; Dividers\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.energystar.gov\/products\" target=\"_blank\" rel=\"noopener\"\u003eENERGY STAR product efficiency guidance\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What types of batteries can the VR452 internal resistance tester measure?\u003c\/h4\u003e\n\u003cp\u003eA: The VR452 battery internal resistance tester is compatible with a wide range of rechargeable and non-rechargeable cells, including lithium-ion, LiFePO4, NiMH, NiCd, and lead-acid batteries, as long as the supply voltage is within the DC 4–12V operating range and the battery voltage falls within the 0.00–45.0 V measurement range.\u003c\/p\u003e\n\u003ch4\u003eQ: Why use a 4-wire measurement method instead of a 2-wire method?\u003c\/h4\u003e\n\u003cp\u003eA: The 4-wire (Kelvin) measurement method uses separate current-carrying and voltage-sensing leads, which eliminates errors caused by the resistance of the test leads themselves. This makes the VR452 significantly more accurate than standard 2-wire testers, especially when measuring very low internal resistance values in the mΩ range.\u003c\/p\u003e\n\u003ch4\u003eQ: Does the VR452 come with a power supply or batteries?\u003c\/h4\u003e\n\u003cp\u003eA: No — the VR452 module requires an external DC 4–12V power supply and does not include batteries or a power adapter. Please ensure you have a suitable power source available before use.\u003c\/p\u003e\n\u003ch4\u003eQ: Can this module be embedded into a custom enclosure or DIY project?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. At just 48 × 29 × 22 mm, the VR452 is specifically designed for integration into custom battery testers, DIY lab instruments, or professional measurement enclosures. Its compact footprint and standard 4-pin wiring make it straightforward to incorporate into your own design.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What types of batteries can the VR452 internal resistance tester measure?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The VR452 battery internal resistance tester is compatible with a wide range of rechargeable and non-rechargeable cells, including lithium-ion, LiFePO4, NiMH, NiCd, and lead-acid batteries, as long as the supply voltage is within the DC 4–12V operating range and the battery voltage falls within the 0.00–45.0 V measurement range.\"}}, {\"@type\": \"Question\", \"name\": \"Why use a 4-wire measurement method instead of a 2-wire method?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The 4-wire (Kelvin) measurement method uses separate current-carrying and voltage-sensing leads, which eliminates errors caused by the resistance of the test leads themselves. 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