{"product_id":"usb-charger-doctor-3-in-1-voltage-current-meter-battery-tester","title":"USB Charger Doctor 3-in-1 Voltage \u0026 Current Meter Tester","description":"\u003ch2\u003eUSB Charger Doctor – 3-in-1 Digital Power Meter\u003c\/h2\u003e\n\u003cp\u003eTake full control of your USB charging setup with this compact \u003cstrong\u003e3-in-1 USB Charger Doctor\u003c\/strong\u003e. Whether you're testing chargers, checking cable efficiency, or monitoring battery capacity, this pocket-sized digital meter gives you real-time voltage and current readings at a glance. Perfect for electronics enthusiasts, DIYers, and anyone who wants to know exactly what their USB devices are drawing.\u003c\/p\u003e\n\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003e3-in-1 Measurement:\u003c\/strong\u003e Simultaneously monitors Voltage, Current, and Battery Capacity in one device.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWide Voltage Range:\u003c\/strong\u003e Measures 4V–20V with ±1% accuracy — compatible with most USB power sources.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePrecise Current Reading:\u003c\/strong\u003e Measures 0–3A with an impressive ±0.4% accuracy for reliable data.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBattery Capacity Tracking:\u003c\/strong\u003e Tracks capacity from 0 to 99,999 mAh, so you can monitor exactly how much charge a device has received.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWorking Time Display:\u003c\/strong\u003e Logs charging session duration from 0–99 hours.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMemory Function:\u003c\/strong\u003e Retains working time and capacity data even after power is disconnected — no lost data on accidental unplugs.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eReset Button (RTZ):\u003c\/strong\u003e Simply press and hold for 3 seconds to reset all readings for a fresh session.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003ePlug-and-Play USB Input:\u003c\/strong\u003e No batteries required — draws power directly from the USB source being tested.\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eTransparent Blue Casing:\u003c\/strong\u003e Sleek, durable plastic housing with a clear view of the internal components.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Digital Voltage \u0026amp; Current Measuring Instrument\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eMaterial:\u003c\/strong\u003e Plastic\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eColor:\u003c\/strong\u003e Transparent Blue\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eSize:\u003c\/strong\u003e 59 × 23 × 13.5 mm\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eVoltage Range:\u003c\/strong\u003e 4V – 20V (±1% accuracy)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCurrent Range:\u003c\/strong\u003e 0 – 3A (±0.4% accuracy)\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCapacity Range:\u003c\/strong\u003e 0 – 99,999 mAh\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eWorking Time:\u003c\/strong\u003e 0 – 99 Hours\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eBattery Required:\u003c\/strong\u003e No\u003c\/li\u003e\n  \u003cli\u003e\n\u003cstrong\u003eCountry of Origin:\u003c\/strong\u003e Made in China\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the Box?\u003c\/h3\u003e\n\u003cul\u003e\n  \u003cli\u003e1× USB Charger Doctor Digital Voltage \u0026amp; Current Meter\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eYou May Also Like\u003c\/h3\u003e\n\u003cp\u003eLooking for more handy tools and accessories? Check out these popular items:\u003c\/p\u003e\n\u003cul\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/10pcs-wooden-handle-nylon-bristle-paint-brush-for-oil-painting-dusting-and-cleaning-unrechargeable-hand-tool-set-without-batt-2\"\u003e10Pcs Wooden Handle Nylon Bristle Paint Brush – Hand Tool Set\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1pc-precision-japanese-double-edged-hand-saw-sk5-steel-fine-toothed-for-carpentry-and-gardening-6-inch-blade-portable-mini-1\"\u003e1pc Precision Japanese Double-Edged Hand Saw – SK5 Steel\u003c\/a\u003e\u003c\/li\u003e\n  \u003cli\u003e\u003ca href=\"\/products\/1-piece-storage-tray-360-degree-refrigerator-storage-rotating-tray-used-for-kitchen-spice-jars-and-sundry-storage-turntable-1\"\u003e360-Degree Rotating Storage Tray for Kitchen \u0026amp; Home\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003eLearn more: \u003ca href=\"https:\/\/www.epa.gov\/recycle\/used-lithium-ion-batteries\" target=\"_blank\" rel=\"noopener\"\u003eEPA guidance on lithium-ion battery handling\u003c\/a\u003e\u003c\/p\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003ch4\u003eQ: What does the USB Charger Doctor measure?\u003c\/h4\u003e\n\u003cp\u003eA: The USB Charger Doctor measures three key parameters simultaneously: voltage (4V–20V), current (0–3A), and accumulated battery capacity (0–99,999 mAh). It also tracks the total charging session duration up to 99 hours, making it a comprehensive USB power monitoring tool.\u003c\/p\u003e\n\u003ch4\u003eQ: Does this USB voltage meter need batteries to operate?\u003c\/h4\u003e\n\u003cp\u003eA: No batteries are required. The USB Charger Doctor is powered directly by the USB source you are testing, so it's always ready to use without any additional setup.\u003c\/p\u003e\n\u003ch4\u003eQ: Will the data be lost if the USB device is unplugged?\u003c\/h4\u003e\n\u003cp\u003eA: No. The device features a built-in memory function that retains the working time and accumulated capacity readings even when power is disconnected, so your session data is preserved.\u003c\/p\u003e\n\u003ch4\u003eQ: How do I reset the readings on the USB current meter?\u003c\/h4\u003e\n\u003cp\u003eA: Simply press and hold the RTZ (Reset) button for approximately 3 seconds. This will clear all accumulated data and start a fresh measurement session.\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 does the USB Charger Doctor measure?\", \"acceptedAnswer\": {\"@type\": \"Answer\", \"text\": \"The USB Charger Doctor measures three key parameters simultaneously: voltage (4V–20V), current (0–3A), and accumulated battery capacity (0–99,999 mAh). 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This will clear all accumulated data and start a fresh measurement session.\"}}]}\u003c\/script\u003e\n\u003cscript type=\"application\/ld+json\"\u003e{\"@context\": \"https:\/\/schema.org\", \"@type\": \"BreadcrumbList\", \"itemListElement\": [{\"@type\": \"ListItem\", \"position\": 1, \"name\": \"Home\", \"item\": \"https:\/\/pg0se5-51.myshopify.com\/\"}, {\"@type\": \"ListItem\", \"position\": 2, \"name\": \"Home page\", \"item\": \"https:\/\/pg0se5-51.myshopify.com\/collections\/frontpage\"}, {\"@type\": \"ListItem\", \"position\": 3, \"name\": \"USB Charger Doctor 3-in-1 Voltage \u0026 Current Meter Tester\", \"item\": \"https:\/\/pg0se5-51.myshopify.com\/products\/usb-charger-doctor-3-in-1-voltage-current-meter-battery-tester\"}]}\u003c\/script\u003e","brand":"Babs","offers":[{"title":"blue","offer_id":53127646249100,"sku":"14:175#blue","price":14.82,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/2862\/6316\/files\/S2d7a31f978004124813adc13f80a1f9cq.webp?v=1787155126","url":"https:\/\/babcustomersupport.com\/products\/usb-charger-doctor-3-in-1-voltage-current-meter-battery-tester","provider":"Babs","version":"1.0","type":"link"}