{"product_id":"0-28-dc-digital-voltmeter-ammeter-2-in-1-dual-display-12v-24v-panel-gauge","title":"0.28\" DC Digital Voltmeter Ammeter — 2-in-1 Dual Display, 12V\/24V Panel Volt Amp Gauge","description":"\u003ch2\u003e0.28\" DC Digital Voltmeter Ammeter — 2-in-1 Dual Display, 12V \/ 24V Panel Volt Amp Gauge\u003c\/h2\u003e\u003cp\u003eThis compact 0.28\" LED dual-display panel meter simultaneously shows DC voltage and current on two separate 3-digit LED displays. With a built-in shunt resistor and a measurement range covering 12V and 24V DC systems, it is the standard panel meter for DIY power supplies, battery monitors, solar charge controllers, car battery monitors, and bench power supply builds. Panel-mount cutout installation takes minutes with the included mounting hardware.\u003c\/p\u003e\u003ch3\u003eKey Specifications\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eParameter\u003c\/th\u003e\n\u003cth\u003eValue\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisplay\u003c\/td\u003e\n\u003ctd\u003eDual 0.28\" 3-digit LED (voltage + current)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Measurement Range\u003c\/td\u003e\n\u003ctd\u003e0–99.9V DC (typical range 4.5–30V)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Measurement Range\u003c\/td\u003e\n\u003ctd\u003e0–10A (with onboard shunt)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eVoltage Accuracy\u003c\/td\u003e\n\u003ctd\u003e±1% ±0.1V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent Accuracy\u003c\/td\u003e\n\u003ctd\u003e±1% ±0.1A\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSupply Voltage\u003c\/td\u003e\n\u003ctd\u003e4.5V – 30V DC (from measured circuit)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eDisplay Color\u003c\/td\u003e\n\u003ctd\u003eRed (voltage) + Red (current) or dual color (variant)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePanel Cutout\u003c\/td\u003e\n\u003ctd\u003e~45 × 26mm (verify with product dimensions)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eOperating Temperature\u003c\/td\u003e\n\u003ctd\u003e-10°C to +65°C\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eWiring Configuration\u003c\/h3\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003cth\u003eWire\u003c\/th\u003e\n\u003cth\u003eColor\u003c\/th\u003e\n\u003cth\u003eConnection\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower supply +\u003c\/td\u003e\n\u003ctd\u003eRed\u003c\/td\u003e\n\u003ctd\u003ePositive of measured circuit (4.5–30V)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePower supply −\u003c\/td\u003e\n\u003ctd\u003eBlack\u003c\/td\u003e\n\u003ctd\u003eNegative of measured circuit (GND)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent sense +\u003c\/td\u003e\n\u003ctd\u003eYellow\u003c\/td\u003e\n\u003ctd\u003ePositive terminal of load (after shunt)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eCurrent sense −\u003c\/td\u003e\n\u003ctd\u003eWhite (if present)\u003c\/td\u003e\n\u003ctd\u003eNegative terminal of load\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch3\u003eWhy Choose This 2-in-1 Panel Meter?\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimultaneous V + A display\u003c\/strong\u003e — monitor both voltage and current at a glance without switching modes\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in shunt\u003c\/strong\u003e — no external shunt resistor needed for currents up to 10A\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePanel mount\u003c\/strong\u003e — installs in standard rectangular cutout for professional-looking enclosure integration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4.5–30V self-powered\u003c\/strong\u003e — powered directly from the measured circuit, no separate supply needed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact 0.28\" display\u003c\/strong\u003e — fits in tight panel spaces while remaining readable\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eCompatible With \/ Common Use Cases\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDIY bench power supply\u003c\/strong\u003e: Monitor output voltage and current of LM317 or LM2596-based adjustable supply\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCar battery monitor\u003c\/strong\u003e: 12V\/24V battery voltage and alternator charging current display\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSolar charge controller\u003c\/strong\u003e: Monitor solar panel output voltage and charging current to battery\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLi-ion battery pack\u003c\/strong\u003e: Monitor 3S\/4S\/5S pack voltage and discharge current\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eArduino power monitor\u003c\/strong\u003e: Monitor 5V supply voltage and total current draw of Arduino + shields\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\u003cp\u003e\u003cstrong\u003eQ: How do I wire this meter to measure both voltage and current?\u003c\/strong\u003e\u003cbr\u003eA: Connect the red wire to the positive terminal of your power source. Connect the black wire to the negative terminal (GND). For current measurement, the load must be connected in series with the meter’s current sense input — connect the positive load terminal to the yellow wire. The meter measures current through its internal shunt. Refer to the wiring diagram included with the product.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: Can this meter measure current above 10A?\u003c\/strong\u003e\u003cbr\u003eA: The onboard shunt is rated for 10A maximum. For higher currents, use an external shunt resistor (e.g., 75mV\/100A shunt) and connect the meter’s current sense input across the external shunt. Recalibrate the meter if needed. Exceeding 10A through the onboard shunt will damage the meter.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eQ: How do I calibrate the voltage and current readings?\u003c\/strong\u003e\u003cbr\u003eA: Most versions have a small trimmer potentiometer on the back for voltage calibration. Compare the meter reading to a known-accurate multimeter and adjust the trimmer until readings match. For current calibration, use a known load and reference ammeter. Some versions are factory-calibrated and do not require adjustment.\u003c\/p\u003e\u003ch3\u003ePackage Contents\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e1× 0.28\" DC Digital Voltmeter Ammeter Panel Meter (2-in-1 dual display)\u003c\/li\u003e\n\u003cli\u003e1× Panel mounting hardware\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Keszoox","offers":[{"title":"Default Title","offer_id":46991466725611,"sku":"\u003cnone\u003e","price":5.92,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0677\/1005\/8731\/files\/028-led-dc-digital-voltmeter-ammeter-2in1-dual-display.webp?v=1761719336","url":"https:\/\/keszoox.com\/products\/0-28-dc-digital-voltmeter-ammeter-2-in-1-dual-display-12v-24v-panel-gauge","provider":"Keszoox","version":"1.0","type":"link"}