{"product_id":"dc-2-4-40v-mini-led-digital-voltmeter-0-28-inch-panel-voltage-tester","title":"DC 2.4–40V Mini LED Digital Voltmeter – 0.28\" Panel Tester","description":"\n\u003ch2\u003eDC 2.4–40V Mini LED Digital Voltmeter — Compact \u0026amp; Accurate Voltage Tester\u003c\/h2\u003e\n\u003cp\u003eThis compact 0.28-inch LED digital voltmeter makes monitoring DC voltage fast, easy, and precise. Whether you're checking the charge on a lithium battery pack, verifying your car or motorcycle's electrical system, or testing a DC power supply in your workshop, this tiny panel meter delivers clear, accurate readings every time. Available in your choice of Red, Green, Blue, or Yellow LED display to suit your setup.\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 DC 2.4V–40V (varies slightly by colour variant) with built-in reverse-polarity protection so incorrect wiring won't damage the unit\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh Accuracy:\u003c\/strong\u003e 3‰ measurement accuracy with a fast update rate of ≥200ms per reading\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSmart Decimal Display:\u003c\/strong\u003e Shows two decimal places for voltages below 10V and one decimal place above 10V — giving you the precision you need at every level\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUltra-Compact 0.28\" LED Panel:\u003c\/strong\u003e Designed for tight spaces — perfect for battery enclosures, DIY power banks, vehicle dashboards, and lab benches\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSimple 2-Wire Connection:\u003c\/strong\u003e Comes pre-wired and ready to connect; easy to install and remove without specialist tools\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eFine-Tuning Function:\u003c\/strong\u003e On-board calibration trim allows you to zero-in readings for maximum accuracy\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eLow Power Draw:\u003c\/strong\u003e Working current under 30mA keeps parasitic drain to an absolute minimum\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColour Options:\u003c\/strong\u003e Red, Yellow, Green, or Blue LED display — choose the colour that best suits your build\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eWorking Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC 2.4V – 40V (with reverse protection)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDetection Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eRed: 2.5–40V | Yellow\/Green: 2.6–40V | Blue: 3.2–40V\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\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\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\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\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\u003eOperating 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 Panel with 2 pre-wired leads\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eTypical Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e18650 lithium cells, mobile phone battery packs, and NiMH battery assemblies\u003c\/li\u003e\n  \u003cli\u003eCar, motorcycle, and electric-vehicle battery monitoring\u003c\/li\u003e\n  \u003cli\u003eDIY DC power supplies and bench power units\u003c\/li\u003e\n  \u003cli\u003eElectric bicycle battery management\u003c\/li\u003e\n  \u003cli\u003eScientific research, teaching, and electronics prototyping\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eImportant Notes\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eMaximum input voltage must not exceed 40V to avoid damage\u003c\/li\u003e\n  \u003cli\u003eDisplay brightness may reduce slightly when the measured voltage falls below 3.0V; this does not affect measurement accuracy\u003c\/li\u003e\n  \u003cli\u003eAvoid direct sunlight on the display for best visibility\u003c\/li\u003e\n  \u003cli\u003eManual measurement: please allow ±1–3mm dimensional tolerance\u003c\/li\u003e\n  \u003cli\u003eScreen colours in photos may vary slightly from actual LED colour due to monitor differences\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eMade in Mainland China.\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\/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 types of batteries can this digital voltmeter measure?\u003c\/h4\u003e\n\u003cp\u003eA: This voltmeter is designed for a wide range of DC voltage sources within the 2.4V–40V range. It works with 18650 lithium cells, mobile phone lithium battery packs, nickel-metal hydride (NiMH) battery assemblies, as well as car, motorcycle, and electric-vehicle 12V or 24V battery systems.\u003c\/p\u003e\n\u003ch4\u003eQ: Does this voltmeter protect against reverse polarity?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The unit features a built-in reverse-polarity protection circuit. If the wires are accidentally connected the wrong way, the meter will not be damaged — giving you peace of mind during installation.\u003c\/p\u003e\n\u003ch4\u003eQ: Can I adjust the reading for more accurate results?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. The voltmeter includes a fine-tuning (calibration trim) function that lets you make small adjustments to align the displayed reading with a known reference, ensuring the highest possible accuracy for your specific application.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this voltmeter suitable for permanent panel installation?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. Its ultra-compact 0.28-inch footprint is specifically designed for panel mounting in tight spaces such as battery enclosures, DIY power bank housings, vehicle dashboards, and control boxes. The simple 2-wire connection makes both installation and removal quick and straightforward.\u003c\/p\u003e\n\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"FAQPage\", \"mainEntity\": [{\"@type\": \"Question\", \"name\": \"What types of batteries can this digital voltmeter measure?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"This voltmeter is designed for a wide range of DC voltage sources within the 2.4V–40V range. It works with 18650 lithium cells, mobile phone lithium battery packs, nickel-metal hydride (NiMH) battery assemblies, as well as car, motorcycle, and electric-vehicle 12V or 24V battery systems.\"}}, {\"@type\": \"Question\", \"name\": \"Does this voltmeter protect against reverse polarity?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"Yes. The unit features a built-in reverse-polarity protection circuit. 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