{"product_id":"mini-oled-digital-voltmeter-dc-5-30v-temperature-meter-ntc-probe","title":"Gaqqee Mini OLED Voltmeter DC 5–30V \u0026 Temperature Meter","description":"\n\u003ch2\u003eGaqqee Mini OLED Digital Voltmeter \u0026amp; Temperature Meter — DC 5–30V with NTC Probe\u003c\/h2\u003e\n\u003cp\u003eMonitor voltage and temperature simultaneously with this ultra-compact \u003cstrong\u003eGaqqee Mini OLED Digital Voltmeter\u003c\/strong\u003e. Featuring a crisp 0.77-inch OLED display and a 12-bit high-precision ADC, it delivers accurate, real-time readings in a sleek 30 × 11.9 × 4.2 mm form factor — perfect for DIY builds, embedded systems, adjustable power supplies, and vehicle battery monitoring.\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\u003eDual-Display Convenience:\u003c\/strong\u003e Shows DC voltage (0–30 V) and temperature (0–99 °C) at the same time for real-time tracking of both parameters.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eHigh-Precision Measurement:\u003c\/strong\u003e 12-bit ADC sampling with ±0.009 accuracy class and a fast ~250 samples\/second sampling rate ensures reliable, low-error readings.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVivid OLED Screen:\u003c\/strong\u003e 0.77-inch OLED display with 128 × 64 resolution provides bright, clear readouts even in low-light environments.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eUltra-Compact Profile:\u003c\/strong\u003e At just 30 × 11.9 × 4.2 mm, it integrates seamlessly into tight spaces, enclosures, and embedded panels.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Compatibility:\u003c\/strong\u003e Operates on DC 5–30 V; usable directly in 5–24 V systems without an external voltage regulator.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReverse-Polarity Tolerant:\u003c\/strong\u003e Will not be damaged if the positive and negative power supply terminals are accidentally reversed — added peace of mind during wiring.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCE, RoHS \u0026amp; WEEE Certified\u003c\/strong\u003e for your confidence in quality and compliance.\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\u003eOperating Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC 5–30 V\u003c\/td\u003e\n\u003c\/tr\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\u003eOperating Current\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≈ 8 mA\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±0.009\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eSampling Rate\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e≈ 250 times\/second\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eTemperature Display\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0–99 °C (NTC probe included)\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDisplay\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e0.77-inch OLED, 128 × 64 resolution\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003eDimensions\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003e30 × 11.9 × 4.2 mm\u003c\/td\u003e\n\u003c\/tr\u003e\n    \u003ctr\u003e\n\u003ctd\u003e\u003cstrong\u003ePower Source\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd\u003eDC (no battery included)\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, WEEE\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\u003eWiring Guide\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eYellow wire:\u003c\/strong\u003e Voltage sampling input\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eRed wire:\u003c\/strong\u003e Power supply positive terminal (+)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBlack wire:\u003c\/strong\u003e Power supply negative terminal (−)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eNo external voltage regulator needed for 5–24 V systems. The meter is also protected against accidental reversal of power supply polarity.\u003c\/p\u003e\n\n\u003ch3\u003eIdeal Applications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003eDIY electronics modifications and custom builds\u003c\/li\u003e\n  \u003cli\u003eAdjustable power supply output voltage display\u003c\/li\u003e\n  \u003cli\u003eIndustrial control equipment monitoring\u003c\/li\u003e\n  \u003cli\u003eSensor power supply voltage detection\u003c\/li\u003e\n  \u003cli\u003eVehicle and battery voltage monitoring\u003c\/li\u003e\n  \u003cli\u003eEmbedded system panels and enclosures\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003ePackage Contents\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1 × Mini OLED Digital Voltmeter \u0026amp; Temperature Meter (NTC probe included)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cp\u003eExplore more products from our store:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/ancient-nutrition-multi-collagen-advanced-muscle-60-capsules\"\u003eAncient Nutrition Multi Collagen Advanced Muscle 60 Capsules\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/bu-29mm-sinking-minnow-jerkbait-fishing-lure-bass-trout-pike\"\u003eB\u0026amp;U 29mm Sinking Minnow Jerkbait Lure – Bass Trout Pike\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/bu-soft-crawfish-bass-fishing-lure-salted-craw-bait-5-pack\"\u003eB\u0026amp;U Soft Crawfish Bass Lure – Salted Craw Bait 5 Pack\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\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 this OLED digital voltmeter measure?\u003c\/h4\u003e\n\u003cp\u003eA: The Gaqqee mini digital voltmeter measures DC voltages from 0 to 30 V, with an operating input voltage of DC 5–30 V. It can be used directly in 5–24 V systems without requiring an external voltage regulator.\u003c\/p\u003e\n\u003ch4\u003eQ: Does the voltmeter also measure temperature, and what probe does it use?\u003c\/h4\u003e\n\u003cp\u003eA: Yes — it includes an NTC (Negative Temperature Coefficient) probe that measures ambient or contact temperature in the range of 0–99 °C, displayed simultaneously alongside the voltage reading on the OLED screen.\u003c\/p\u003e\n\u003ch4\u003eQ: How accurate is this mini voltmeter, and how fast does it sample?\u003c\/h4\u003e\n\u003cp\u003eA: The voltmeter uses a 12-bit high-precision ADC with an accuracy class of ±0.009 and a sampling rate of approximately 250 readings per second, ensuring highly responsive and reliable voltage and temperature data.\u003c\/p\u003e\n\u003ch4\u003eQ: Is this voltmeter protected against incorrect wiring?\u003c\/h4\u003e\n\u003cp\u003eA: Yes. The device is designed to withstand accidental reversal of the positive and negative power supply terminals without sustaining damage, making it forgiving and beginner-friendly for DIY installations.\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 this OLED digital voltmeter measure?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The Gaqqee mini digital voltmeter measures DC voltages from 0 to 30 V, with an operating input voltage of DC 5–30 V. 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