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Power measurement profileKlein Tools

ET920 USB Digital Meter

Checking phone, tablet and compatible USB-C charging energy without opening a mains circuit.

Official specification snapshot

Know the meter’s limit before the load.

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
Safe workflow

From connection to useful number.

  1. 01Check that the negotiated USB voltage stays within 3–20V
  2. 02Place the meter inline between source and device
  3. 03Let the charge or use session complete
  4. 04Use Wh for energy and W for the live load
Evidence checked 2026-08-22

Read the exact manufacturer instructions.

Product revisions, plugs and certifications can differ by country. Confirm the exact regional model in the official instructions; the documented limit always overrides this summary.

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