Klein Tools ET920 USB Digital Meter
3–20V DC · up to 3A USB-A / 5A USB-C · Voltage, current, capacity, energy and calculated resistance. USB-A and most USB-C power paths. Confirm the exact regional electrical rating and local delivery terms.
Measurement profile
USB meter; region per source record: USB-A and most USB-C power paths; measures Voltage, current, capacity, energy and calculated resistance; range 3–20V DC · up to 3A USB-A / 5A USB-C.
What it is for
Checking phone, tablet and compatible USB-C charging energy without opening a mains circuit.
Practical caution
The documented ceiling is 20V. It is not suitable for USB-C EPR modes above 20V, and it does not display current below 50mA.
Working method
1. Check that the negotiated USB voltage stays within 3–20V 2. Place the meter inline between source and device 3. Let the charge or use session complete 4. Use Wh for energy and W for the live load
Documented facts
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
Source
Source: Klein Tools official specifications (kleintools.com); checked 2026-08-22.
Buying checks for the United Kingdom
Measurement path: Choose a meter made for the exact AC, DC, USB or battery path. Do not insert a low-voltage meter into a mains circuit. Safety rating: Confirm voltage, current, connector and measurement-category ratings from the exact manual before connecting a live circuit. Data you need: Make sure the meter captures the required value: running watts, startup event, accumulated Wh or battery current over time. Regional version: Socket meters and electrical accessories vary by outlet standard and certification. Verify the exact model sold for your country.
Regional note
USB-A and most USB-C power paths. Confirm the exact regional electrical rating and local delivery terms.
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