USB Digital Meter and Tester - USB-A (Type A)


  • 3 to 20V DC; Current: 0.05 to 3A (monitoring mode)
  • Built-in test loads of 0.5A, 1A, 2A, and 3A; no external test load is required
  • Continuously monitor up to 1000 hours of voltage, current, capacity/charge delivered, energy and resistance (calculated)
  • Tests most common standard USB-A ports, including Qualcomm Quick Charge® ports
  • Store and recall up to 10 readings
  • Voltage and current overload detection
  • Hi-resolution LCD for clear visibility in environments with low ambient lighting
  • Durable cable to allow easy access to hard-to-reach ports
  • Rugged, pocket-sized and lightweight Klein industrial design stands up to jobsite demands
  • Built to withstand a 6.6' (2 m) drop
  • No batteries needed; powered by the USB port that is being tested
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The Klein Tools ET910 is a USB digital meter and tester combination for most common USB-A ports, including Qualcomm Quick Charge® ports. It accurately and reliably measures and displays the USB port voltage, current, capacity, energy and resistance simultaneously. It can also test the maximum current delivery capability of the USB port with built-in fixed loads, so the user need not connect to an external load. It can function with any USB-A port that has the ability to deliver power. It requires NO batteries as it draws power from the power source to function.

USB-A (Type A)
USB Port Voltage, Current, Capacity, Energy, Resistance (Calculated), Max Current
Special Features:
Current Test Loads: 0.5A, 1A, 2A, 3A
3 to 20V DC
0.05 to 3A
Voltage: 3 to 20V DC +/-1% (+/-2 Bytes); Current: 0.05 to 3A +/-1% (+/-2 Bytes)
Capacity used:
99999 mAh Maximum
Energy delivered:
999 Wh Maximum
400 Ohms Maximum
Elapsed time:
Up to 999 hours, 59 min, 59 secs
USB Compatibility:
USB-A; Qualcomm Quick Charge® Compatible
Drop Protection:
2 m (6.6')
Ingress protection:
Overall Length:
4.31'' (11 cm)
Overall Height:
0.98'' (2.5 cm)
Overall Width:
2.15'' (5.5 cm)
2.80 oz (79.4 g)
Additional Information
  • To ensure the safe operation and service of this meter, follow all instructions. Failure to observe these warnings can result in severe injury or death.
  • This meter will NOT display a current below 50 milliamperes, even if it is allowing this to pass through. NOTE: The display will show zero current.
  • Do NOT use with ports that operate outside of the rated voltage and current. NEVER use on a circuit with a voltage or current that exceeds the maximum specified for this device.
  • Do NOT use during electrical storms or in wet weather. Do NOT use if the meter appears to be damaged. Use caution when working with voltages above 25 V AC RMS or 24 V DC. Such voltages pose a shock hazard.