USB Charger Doctor 3-in-1 Voltage & Current Meter Tester
USB Charger Doctor 3-in-1 Voltage & Current Meter Tester
USB Charger Doctor – 3-in-1 Digital Power Meter
Take full control of your USB charging setup with this compact 3-in-1 USB Charger Doctor. 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.
Key Features
- 3-in-1 Measurement: Simultaneously monitors Voltage, Current, and Battery Capacity in one device.
- Wide Voltage Range: Measures 4V–20V with ±1% accuracy — compatible with most USB power sources.
- Precise Current Reading: Measures 0–3A with an impressive ±0.4% accuracy for reliable data.
- Battery Capacity Tracking: Tracks capacity from 0 to 99,999 mAh, so you can monitor exactly how much charge a device has received.
- Working Time Display: Logs charging session duration from 0–99 hours.
- Memory Function: Retains working time and capacity data even after power is disconnected — no lost data on accidental unplugs.
- Reset Button (RTZ): Simply press and hold for 3 seconds to reset all readings for a fresh session.
- Plug-and-Play USB Input: No batteries required — draws power directly from the USB source being tested.
- Transparent Blue Casing: Sleek, durable plastic housing with a clear view of the internal components.
Specifications
- Type: Digital Voltage & Current Measuring Instrument
- Material: Plastic
- Color: Transparent Blue
- Size: 59 × 23 × 13.5 mm
- Voltage Range: 4V – 20V (±1% accuracy)
- Current Range: 0 – 3A (±0.4% accuracy)
- Capacity Range: 0 – 99,999 mAh
- Working Time: 0 – 99 Hours
- Battery Required: No
- Country of Origin: Made in China
What's in the Box?
- 1× USB Charger Doctor Digital Voltage & Current Meter
You May Also Like
Looking for more handy tools and accessories? Check out these popular items:
- 10Pcs Wooden Handle Nylon Bristle Paint Brush – Hand Tool Set
- 1pc Precision Japanese Double-Edged Hand Saw – SK5 Steel
- 360-Degree Rotating Storage Tray for Kitchen & Home
Learn more: EPA guidance on lithium-ion battery handling
Frequently Asked Questions
Q: What does the USB Charger Doctor measure?
A: 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.
Q: Does this USB voltage meter need batteries to operate?
A: 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.
Q: Will the data be lost if the USB device is unplugged?
A: 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.
Q: How do I reset the readings on the USB current meter?
A: Simply press and hold the RTZ (Reset) button for approximately 3 seconds. This will clear all accumulated data and start a fresh measurement session.
Production & Packaging Notice
To 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.