{"product_id":"dc-0-30v-mini-digital-voltmeter-oled-12-bit-adc-ultra-slim","title":"DC 0-30V Mini Digital Voltmeter – OLED 12-Bit ADC Gaqqee","description":"\n\u003ch2\u003eGaqqee Ultra-Slim Mini Digital Voltmeter – Precision Voltage Monitoring in a Compact Form Factor\u003c\/h2\u003e\n\n\u003cp\u003eMeet the \u003cstrong\u003eGaqqee DC 0–30V Ultra-Slim Mini Digital Voltmeter\u003c\/strong\u003e — a high-precision, space-saving voltage measurement module purpose-built for DIY electronics, embedded systems, industrial control panels, and automotive battery monitoring. Measuring just \u003cstrong\u003e37.5 × 15 × 3 mm\u003c\/strong\u003e, this sleek module slips effortlessly into tight enclosures while delivering professional-grade accuracy you can rely on.\u003c\/p\u003e\n\n\u003cp\u003eMade in Mainland China.\u003c\/p\u003e\n\n\u003ch3\u003eWhy You'll Love This Voltmeter\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUltra-compact, ultra-slim profile\u003c\/strong\u003e – At only 3 mm thick, it integrates seamlessly into power supplies, control boards, and custom enclosures without sacrificing readability.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003e12-bit ADC high-precision sampling\u003c\/strong\u003e – Delivers approximately 0.7% measurement accuracy (e.g., a 10 V input displays with ≤0.07 V error), ensuring reliable and repeatable readings every time.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCrisp 0.5-inch OLED display (88×48 resolution)\u003c\/strong\u003e – Bright white characters with auto-shifting decimal point make readings instantly clear, even in low-light environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eAdjustable refresh rate: 5 Hz \/ 10 Hz\u003c\/strong\u003e – Default 5 Hz is ideal for stable readings; short-circuit Pin B to switch to 10 Hz for real-time tracking of fast-changing voltage dynamics.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide measurement \u0026amp; supply range\u003c\/strong\u003e – Measures DC 0–30 V; supply voltage DC 3.5–30 V; operating current \u0026lt;20 mA — efficient and versatile.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eConfigurable jumper settings\u003c\/strong\u003e – Jumper A toggles the voltage \"V\" symbol on\/off; Jumper B switches refresh rate — customize the display to suit your project.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCE \u0026amp; RoHS certified\u003c\/strong\u003e – Meets international safety and environmental standards.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\n\u003ctable\u003e\n  \u003ctbody\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMeasurement Range\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC 0–30 V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSupply Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC 3.5–30 V\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eOperating Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e\u0026lt;20 mA\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eADC Resolution\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e12-bit\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eMeasurement Accuracy\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≈0.7%\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDisplay\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.5-inch OLED, 88×48 px, white characters\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eRefresh Rate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e5 Hz (default) \/ 10 Hz (Pin B jumpered)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e37.5 × 15 × 3 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eCertifications\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eCE, RoHS\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\u003eMainland China\u003c\/td\u003e\n\u003c\/tr\u003e\n  \u003c\/tbody\u003e\n\u003c\/table\u003e\n\n\u003ch3\u003eJumper Configuration Guide\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eJumper A (open – default):\u003c\/strong\u003e Voltage symbol \"V\" is displayed. \u003cstrong\u003eJumper A (closed):\u003c\/strong\u003e \"V\" symbol hidden.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eJumper B (open – default):\u003c\/strong\u003e 5 Hz refresh rate. \u003cstrong\u003eJumper B (closed \/ short-circuited):\u003c\/strong\u003e 10 Hz refresh rate for dynamic voltage tracking.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eIdeal Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eAdjustable bench power supply voltage display\u003c\/li\u003e\n  \u003cli\u003eIndustrial control equipment panels\u003c\/li\u003e\n  \u003cli\u003eSensor supply voltage monitoring\u003c\/li\u003e\n  \u003cli\u003eVehicle\/battery voltage monitoring\u003c\/li\u003e\n  \u003cli\u003eDIY electronics \u0026amp; embedded system projects\u003c\/li\u003e\n  \u003cli\u003eRobotics and maker projects\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× Ultra-Slim Mini Digital Voltmeter Module\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLooking for more DIY tools and project supplies? Check out our \u003ca href=\"\/products\/leather-hole-punch-tool-diy-stitching-punch-4-5-6mm\"\u003eLeather Hole Punch Tool | DIY Stitching Punch\u003c\/a\u003e or keep your components neatly organized with the \u003ca href=\"\/products\/airtight-transparent-pet-storage-bottle-craft-beads-home-organization\"\u003eAirtight Transparent PET Storage Bottle for Beads \u0026amp; Crafts\u003c\/a\u003e. Need precision craft tools? Explore our \u003ca href=\"\/products\/stainless-steel-ceramic-trimming-tool-curved-skip-knife\"\u003eStainless Steel Ceramic Trimming Tool\u003c\/a\u003e.\u003c\/p\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.osha.gov\/eye-face-protection\" target=\"_blank\" rel=\"noopener\"\u003eOSHA on eye and face protection\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What voltage range can the mini digital voltmeter measure?\u003c\/h4\u003e\n\u003cp\u003eA: The Gaqqee mini digital voltmeter measures DC 0–30 V. It requires a supply voltage of DC 3.5–30 V and consumes less than 20 mA during operation, making it suitable for a wide range of electronics and embedded applications.\u003c\/p\u003e\n\u003ch4\u003eQ: How do I switch the refresh rate from 5 Hz to 10 Hz?\u003c\/h4\u003e\n\u003cp\u003eA: Simply short-circuit (jumper) Pin B on the module. By default the refresh rate is 5 Hz, which is great for stable voltage displays. Shorting Pin B switches it to 10 Hz, enabling faster real-time tracking of changing voltage levels.\u003c\/p\u003e\n\u003ch4\u003eQ: Can this voltmeter be embedded into a custom enclosure or power supply?\u003c\/h4\u003e\n\u003cp\u003eA: Absolutely. At just 37.5 × 15 × 3 mm, the ultra-slim profile is specifically designed for embedded integration into adjustable power supplies, control panels, battery monitors, robotics projects, and any compact DIY electronics build.\u003c\/p\u003e\n\u003ch4\u003eQ: What does the 12-bit ADC mean for measurement accuracy?\u003c\/h4\u003e\n\u003cp\u003eA: The 12-bit ADC provides high-resolution analog-to-digital conversion, resulting in approximately 0.7% measurement accuracy. For example, at a 10 V input, the display error is no more than ±0.07 V — highly reliable for electronics testing and monitoring.\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 voltage range can the mini digital voltmeter measure?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The Gaqqee mini digital voltmeter measures DC 0–30 V. 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