Klein Tools
ET920 USB Digital Meter
Checking phone, tablet and compatible USB-C charging energy without opening a mains circuit.
- Measurement path
- USB device
- Range
- 3–20V DC · up to 3A USB-A / 5A USB-C
- Execution
- USB-A and most USB-C power paths
Before use
The documented ceiling is 20V. It is not suitable for USB-C EPR modes above 20V, and it does not display current below 50mA.
What can this meter measure?Measurement range and technical limits.View detailsClose+
Key limits
Know the meter limits before connecting.
Voltage, current, capacity, energy and calculated resistance
- Voltage range
- 3–20V DC
- Current range
- 0.05–3A USB-A · 0.05–5A USB-C
- Energy display
- Up to 999Wh
- Capacity display
- Up to 99,999mAh
How to use this meterWorkflow, cautions and official instructions.View detailsClose+
Safe measurement
From connection to a useful measurement.
- 01Check that the negotiated USB voltage stays within 3–20V
- 02Place the meter inline between source and device
- 03Let the charge or use session complete
- 04Use Wh for energy and W for the live load
Source checked on 2026-08-22
Open the official manufacturer source ↗Read the instructions for this exact model.
Versions, plugs, certification and availability vary by country. These are source-model technical references, not confirmed Nigerian supply or compatibility. Follow the manufacturer’s limits.