{"product_id":"dc-2-4-40v-mini-led-digital-voltmeter-car-battery-tester","title":"DC 2.4-40V Mini LED Digital Voltmeter – Car \u0026 Battery Tester","description":"\u003ch2\u003eDC 2.4–40V Mini LED Digital Voltmeter\u003c\/h2\u003e\n\u003cp\u003eKeep a precise eye on your DC voltage with this compact 0.28-inch LED digital voltmeter. Designed for cars, motorcycles, battery packs, electric vehicles, and DIY electronics, this mini panel meter delivers fast, accurate readings at a glance — in your choice of four vibrant display colours: \u003cstrong\u003eRed, Green, Blue, or Yellow\u003c\/strong\u003e. Made in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Measurement Range:\u003c\/strong\u003e Detects DC voltages from 2.4V up to 40V — covers 18650 cells, lithium phone batteries, NiMH packs, car batteries, motorcycle batteries, and more.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Accuracy:\u003c\/strong\u003e 3‰ measurement accuracy with a fast refresh rate (≥200ms\/reading) for reliable, real-time readings.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eDual Decimal Precision:\u003c\/strong\u003e Displays two decimal places for voltages below 10V, and one decimal place above 10V — balancing precision and clarity automatically.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReverse Polarity Protection:\u003c\/strong\u003e Built-in protection prevents damage if wires are connected incorrectly — no burnt components, no headaches.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUltra-Compact 0.28\" Display:\u003c\/strong\u003e The tiny footprint fits perfectly in tight spaces — dashboards, battery housings, DIY enclosures, and project boxes.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eEasy 2-Wire Installation:\u003c\/strong\u003e Simple two-wire hookup makes connecting to your vehicle, battery pack, or power supply quick and straightforward.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFine-Tuning Function:\u003c\/strong\u003e Calibrate the reading on-the-fly for even greater measurement confidence.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow Power Draw:\u003c\/strong\u003e Operates on less than 30mA working current — won't drain your battery.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColour Options:\u003c\/strong\u003e Available in Red (range: 2.5–40V), Yellow (2.6–40V), Green (2.6–40V), and Blue (3.2–40V).\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC 2.4V – 40V (with reverse polarity protection)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDetection Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC 2.4V – 40V\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;30mA\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDisplay\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.28\" LED (Red \/ Green \/ Blue \/ Yellow)\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMeasurement Rate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≥200mS\/reading\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMeasurement Accuracy\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e3‰\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e-10°C to +65°C\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Humidity\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e10%–80% (non-condensing)\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 × Digital Voltmeter with 2 connection wires\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCountry of Origin\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eMade in Mainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eWhat Can You Measure?\u003c\/h3\u003e\n\u003cp\u003eThis versatile voltmeter is ideal for monitoring:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003eCar and motorcycle batteries\u003c\/li\u003e\n  \u003cli\u003e18650 lithium cells and mobile phone batteries\u003c\/li\u003e\n  \u003cli\u003eNiMH battery packs\u003c\/li\u003e\n  \u003cli\u003eDC power supply outputs\u003c\/li\u003e\n  \u003cli\u003eElectric vehicle battery systems\u003c\/li\u003e\n  \u003cli\u003eScientific research and teaching setups\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003e⚠ Important:\u003c\/strong\u003e Do not exceed 40V input — higher voltages may permanently damage the meter. Avoid direct sunlight exposure during use.\u003c\/p\u003e\n\n\u003ch3\u003eYou Might Also Like\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/air-compressor-pressure-gauge-0-10-0-12-0-25-bar-hydraulic-diy\"\u003eAir Compressor Pressure Gauge 0-10\/0-12\/0-25 Bar | DIY Tool\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/electromagnetic-induction-tester-coil-motherboard-fault-detector\"\u003eElectromagnetic Induction Tester – Coil \u0026amp; Circuit Fault Detector\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/360-bicycle-chain-cleaner-tool-gear-cleaning-kit\"\u003e360° Bicycle Chain Cleaner Tool | Bike Gear Cleaning Kit\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/hand-power-tools\" target=\"_blank\" rel=\"noopener\"\u003eOSHA guidance on hand and power tools\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What voltage range does this LED digital voltmeter support?\u003c\/h4\u003e\n\u003cp\u003eA: This voltmeter supports a DC working and detection voltage range of 2.4V to 40V. Colour-specific lower limits vary slightly: Red starts at 2.5V, Yellow and Green at 2.6V, and Blue at 3.2V. The maximum for all colours is 40V.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Can I use this voltmeter to monitor my car or motorcycle battery?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. The voltmeter is specifically suited for car batteries (typically 12V) and motorcycle batteries. Simply connect the two wires to your power source and the bright LED display will show your real-time voltage reading.\u003c\/p\u003e\n\n\u003ch4\u003eQ: Does it have reverse polarity protection?\u003c\/h4\u003e\n\u003cp\u003eA: Yes — this voltmeter features a built-in reverse polarity protection function. If the wires are accidentally connected in reverse, the unit is protected from damage, giving you peace of mind during installation.\u003c\/p\u003e\n\n\u003ch4\u003eQ: How do I install the voltmeter?\u003c\/h4\u003e\n\u003cp\u003eA: Installation is simple. Two pre-attached wires are included — connect the positive wire to your DC positive terminal and the negative wire to the negative terminal. The display powers up immediately from the measured source, so no separate power supply is needed.\u003c\/p\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What voltage range does this LED digital voltmeter support?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This voltmeter supports a DC working and detection voltage range of 2.4V to 40V. Colour-specific lower limits vary slightly: Red starts at 2.5V, Yellow and Green at 2.6V, and Blue at 3.2V. The maximum for all colours is 40V.\"}}, {\"@type\": \"Question\", \"name\": \"Can I use this voltmeter to monitor my car or motorcycle battery?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Absolutely. 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